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feat: add claude-sonnet-4-6 model metadata to Anthropic adapter (TanStack#378)
Add CLAUDE_SONNET_4_6 with 1M native context window, 64k max output, and adaptive thinking support. Register in all model type maps and add to ts-react-chat example model selector. Co-authored-by: Alem Tuzlak <t.zlak@hotmail.com>
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‎.changeset/add-claude-sonnet-4-6.md‎

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---
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'@tanstack/ai-anthropic': minor
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---
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Add `claude-sonnet-4-6` model metadata to the Anthropic adapter, including 1M native context window and adaptive thinking support.

‎examples/ts-react-chat/src/lib/model-selection.ts‎

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@@ -20,6 +20,11 @@ export const MODEL_OPTIONS: Array<ModelOption> = [
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{ provider: 'openai', model: 'gpt-5', label: 'OpenAI - GPT-5' },
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// Anthropic
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{
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provider: 'anthropic',
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model: 'claude-sonnet-4-6',
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label: 'Anthropic - Claude Sonnet 4.6',
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},
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{
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provider: 'anthropic',
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model: 'claude-sonnet-4-5-20250929',

‎packages/typescript/ai-anthropic/src/model-meta.ts‎

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@@ -108,6 +108,37 @@ const CLAUDE_OPUS_4_5 = {
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AnthropicSamplingOptions
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>
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const CLAUDE_SONNET_4_6 = {
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name: 'claude-sonnet-4-6',
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id: 'claude-sonnet-4-6',
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context_window: 1_000_000,
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max_output_tokens: 64_000,
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knowledge_cutoff: '2025-08-01',
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pricing: {
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input: {
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normal: 3,
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},
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output: {
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normal: 15,
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},
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},
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supports: {
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input: ['text', 'image', 'document'],
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extended_thinking: true,
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adaptive_thinking: true,
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priority_tier: true,
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},
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} as const satisfies ModelMeta<
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AnthropicContainerOptions &
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AnthropicContextManagementOptions &
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AnthropicMCPOptions &
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AnthropicServiceTierOptions &
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AnthropicStopSequencesOptions &
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AnthropicThinkingOptions &
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AnthropicToolChoiceOptions &
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AnthropicSamplingOptions
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>
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const CLAUDE_SONNET_4_5 = {
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name: 'claude-sonnet-4-5',
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id: 'claude-sonnet-4-5',
@@ -395,6 +426,7 @@ const CLAUDE_HAIKU_3 = {
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export const ANTHROPIC_MODELS = [
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CLAUDE_OPUS_4_6.id,
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CLAUDE_OPUS_4_5.id,
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CLAUDE_SONNET_4_6.id,
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CLAUDE_SONNET_4_5.id,
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CLAUDE_HAIKU_4_5.id,
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CLAUDE_OPUS_4_1.id,
@@ -432,6 +464,14 @@ export type AnthropicChatModelProviderOptionsByName = {
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AnthropicThinkingOptions &
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AnthropicToolChoiceOptions &
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AnthropicSamplingOptions
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[CLAUDE_SONNET_4_6.id]: AnthropicContainerOptions &
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AnthropicContextManagementOptions &
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AnthropicMCPOptions &
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AnthropicServiceTierOptions &
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AnthropicStopSequencesOptions &
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AnthropicThinkingOptions &
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AnthropicToolChoiceOptions &
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AnthropicSamplingOptions
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[CLAUDE_SONNET_4_5.id]: AnthropicContainerOptions &
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AnthropicContextManagementOptions &
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AnthropicMCPOptions &
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export type AnthropicModelInputModalitiesByName = {
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[CLAUDE_OPUS_4_6.id]: typeof CLAUDE_OPUS_4_6.supports.input
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[CLAUDE_OPUS_4_5.id]: typeof CLAUDE_OPUS_4_5.supports.input
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[CLAUDE_SONNET_4_6.id]: typeof CLAUDE_SONNET_4_6.supports.input
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[CLAUDE_SONNET_4_5.id]: typeof CLAUDE_SONNET_4_5.supports.input
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[CLAUDE_HAIKU_4_5.id]: typeof CLAUDE_HAIKU_4_5.supports.input
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[CLAUDE_OPUS_4_1.id]: typeof CLAUDE_OPUS_4_1.supports.input

‎packages/typescript/ai-anthropic/tests/model-meta.test.ts‎

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@@ -43,6 +43,30 @@ type BaseOptions = AnthropicContainerOptions &
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describe('Anthropic Model Provider Options Type Assertions', () => {
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describe('Models WITH extended_thinking support', () => {
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it('claude-sonnet-4-6 should support thinking options', () => {
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type Options =
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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// Should have thinking options
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expectTypeOf<Options>().toExtend<AnthropicThinkingOptions>()
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// Should have service tier options (priority_tier support)
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expectTypeOf<Options>().toExtend<AnthropicServiceTierOptions>()
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// Should have base options
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expectTypeOf<Options>().toExtend<BaseOptions>()
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// Verify specific properties exist
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expectTypeOf<Options>().toHaveProperty('thinking')
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expectTypeOf<Options>().toHaveProperty('service_tier')
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expectTypeOf<Options>().toHaveProperty('container')
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expectTypeOf<Options>().toHaveProperty('context_management')
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expectTypeOf<Options>().toHaveProperty('mcp_servers')
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expectTypeOf<Options>().toHaveProperty('stop_sequences')
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expectTypeOf<Options>().toHaveProperty('tool_choice')
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expectTypeOf<Options>().toHaveProperty('top_k')
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})
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it('claude-sonnet-4-5 should support thinking options', () => {
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type Options =
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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type Keys = keyof AnthropicChatModelProviderOptionsByName
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expectTypeOf<'claude-opus-4-5'>().toExtend<Keys>()
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expectTypeOf<'claude-sonnet-4-6'>().toExtend<Keys>()
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expectTypeOf<'claude-sonnet-4-5'>().toExtend<Keys>()
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expectTypeOf<'claude-haiku-4-5'>().toExtend<Keys>()
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expectTypeOf<'claude-opus-4-1'>().toExtend<Keys>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toHaveProperty('container')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toHaveProperty('container')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toHaveProperty('container')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toHaveProperty('context_management')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toHaveProperty('context_management')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toHaveProperty('context_management')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toHaveProperty('mcp_servers')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toHaveProperty('mcp_servers')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toHaveProperty('mcp_servers')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toHaveProperty('stop_sequences')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toHaveProperty('stop_sequences')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toHaveProperty('stop_sequences')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toHaveProperty('tool_choice')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toHaveProperty('tool_choice')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toHaveProperty('tool_choice')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toHaveProperty('top_k')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toHaveProperty('top_k')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toHaveProperty('top_k')
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toExtend<AnthropicThinkingOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toExtend<AnthropicThinkingOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toExtend<AnthropicThinkingOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toExtend<AnthropicServiceTierOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toExtend<AnthropicServiceTierOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toExtend<AnthropicServiceTierOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-opus-4-5']
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>().toExtend<BaseOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-6']
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>().toExtend<BaseOptions>()
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expectTypeOf<
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AnthropicChatModelProviderOptionsByName['claude-sonnet-4-5']
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>().toExtend<BaseOptions>()
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})
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})
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describe('Claude Sonnet 4.6 (text + image + document)', () => {
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type Modalities = AnthropicModelInputModalitiesByName['claude-sonnet-4-6']
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type Message = ConstrainedModelMessage<Modalities>
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it('should allow TextPart, ImagePart, and DocumentPart', () => {
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expectTypeOf<MessageWithContent<TextPart>>().toExtend<Message>()
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expectTypeOf<MessageWithContent<ImagePart>>().toExtend<Message>()
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expectTypeOf<MessageWithContent<DocumentPart>>().toExtend<Message>()
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})
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it('should NOT allow AudioPart or VideoPart', () => {
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expectTypeOf<MessageWithContent<AudioPart>>().not.toExtend<Message>()
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expectTypeOf<MessageWithContent<VideoPart>>().not.toExtend<Message>()
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})
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})
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describe('Claude Sonnet 4.5 (text + image + document)', () => {
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type Modalities = AnthropicModelInputModalitiesByName['claude-sonnet-4-5']
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type Message = ConstrainedModelMessage<Modalities>

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