simstudioai · waleedlatif1 · Sep 22, 2026 · Sep 22, 2026
diff --git a/apps/docs/content/docs/workflows/blocks/agent.mdx b/apps/docs/content/docs/workflows/blocks/agent.mdx
@@ -135,7 +135,7 @@ Live tool-call chips stream for **OpenAI, Anthropic, Azure Anthropic, Google, Ve
 | Provider | Streamed thinking | Models |
 |----------|-------------------|--------|
 | OpenAI | Summaries only — Requires OpenAI organization verification; falls back to no summaries. | `gpt-6-astra`, `gpt-5.6-sol`, `gpt-5.6-terra`, `gpt-5.6-luna`, `gpt-5.5-pro`, `gpt-5.5`, `gpt-5.4-pro`, `gpt-5.4`, `gpt-5.4-mini`, `gpt-5.4-nano`, `gpt-5.3-codex`, `gpt-5.2-pro`, `gpt-5.2`, `gpt-5.1`, `gpt-5-pro`, `gpt-5`, `gpt-5-mini`, `gpt-5-nano`, `o4-mini`, `o3`, `o3-mini`, `o1` |
-| Anthropic | Summaries only — These generations omit full thinking; Sim requests summarized thinking on streaming runs. | `claude-fable-5-1`, `claude-fable-5`, `claude-sonnet-5`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonnet-4-6`, `claude-opus-4-5`, `claude-sonnet-4-5`, `claude-haiku-4-5` |
+| Anthropic | Summaries only — These generations omit full thinking; Sim requests summarized thinking on streaming runs. | `claude-fable-5-1`, `claude-fable-5`, `claude-sonnet-5`, `claude-opus-5-5`, `claude-opus-5`, `claude-opus-4-8`, `claude-opus-4-7`, `claude-opus-4-6`, `claude-sonnet-4-6`, `claude-opus-4-5`, `claude-sonnet-4-5`, `claude-haiku-4-5` |
 | Azure OpenAI | Summaries only — Requires OpenAI organization verification; falls back to no summaries. | `azure/gpt-6-astra`, `azure/gpt-5.6-sol`, `azure/gpt-5.6-terra`, `azure/gpt-5.6-luna`, `azure/gpt-5.5`, `azure/gpt-5.4-pro`, `azure/gpt-5.4`, `azure/gpt-5.4-mini`, `azure/gpt-5.4-nano`, `azure/gpt-5.2`, `azure/gpt-5.1`, `azure/gpt-5.1-codex`, `azure/gpt-5`, `azure/gpt-5-mini`, `azure/gpt-5-nano`, `azure/o3`, `azure/o4-mini` |
 | Azure Anthropic | Summaries only — These generations omit full thinking; Sim requests summarized thinking on streaming runs. | `azure-anthropic/claude-fable-5-1`, `azure-anthropic/claude-opus-5`, `azure-anthropic/claude-opus-4-8`, `azure-anthropic/claude-opus-4-7`, `azure-anthropic/claude-opus-4-6`, `azure-anthropic/claude-opus-4-5`, `azure-anthropic/claude-sonnet-5`, `azure-anthropic/claude-sonnet-4-6`, `azure-anthropic/claude-sonnet-4-5`, `azure-anthropic/claude-opus-4-1`, `azure-anthropic/claude-haiku-4-5` |
 | Google | Summaries only | `gemini-3.8-flash`, `gemini-3.7-flash`, `gemini-3.6-flash`, `gemini-3.5-flash-lite`, `gemini-3.5-flash`, `gemini-3.1-pro-preview`, `gemini-3.1-flash-lite`, `gemini-3-flash-preview`, `gemini-2.5-pro`, `gemini-2.5-flash`, `gemini-2.5-flash-lite` |

diff --git a/apps/sim/providers/anthropic/core.request.test.ts b/apps/sim/providers/anthropic/core.request.test.ts
@@ -296,12 +296,15 @@ describe('executeAnthropicProviderRequest forced tool use', () => {
     expect(payload.tool_choice).toEqual({ type: 'tool', name: 'publish' })
   })
 
-  it('drops forced tool_choice when the catalog model disables Force', async () => {
-    const { payload, warn } = await runWithForcedTool('claude-fable-5-1')
-    expect(payload.tools?.map((tool) => tool.name)).toEqual(['publish'])
-    expect(payload).not.toHaveProperty('tool_choice')
-    expect(warn).toHaveBeenCalledWith(expect.stringContaining('rejects forced tool_choice'))
-  })
+  it.each(['claude-fable-5-1', 'claude-opus-5-5'])(
+    'drops forced tool_choice when the catalog model disables Force (%s)',
+    async (model) => {
+      const { payload, warn } = await runWithForcedTool(model)
+      expect(payload.tools?.map((tool) => tool.name)).toEqual(['publish'])
+      expect(payload).not.toHaveProperty('tool_choice')
+      expect(warn).toHaveBeenCalledWith(expect.stringContaining('rejects forced tool_choice'))
+    }
+  )
 })
 
 describe('executeAnthropicProviderRequest native structured outputs', () => {

diff --git a/apps/sim/providers/anthropic/core.thinking.test.ts b/apps/sim/providers/anthropic/core.thinking.test.ts
@@ -16,6 +16,7 @@ describe('buildThinkingConfig', () => {
       'claude-fable-5-1',
       'claude-fable-5',
       'claude-sonnet-5',
+      'claude-opus-5-5',
       'claude-opus-5',
       'claude-opus-4-8',
       'claude-opus-4-7',
@@ -31,6 +32,7 @@ describe('buildThinkingConfig', () => {
       'claude-fable-5-1',
       'claude-fable-5',
       'claude-sonnet-5',
+      'claude-opus-5-5',
       'claude-opus-5',
       'claude-opus-4-8',
       'claude-opus-4-7',

diff --git a/apps/sim/providers/anthropic/core.ts b/apps/sim/providers/anthropic/core.ts
@@ -143,7 +143,7 @@ const ANTHROPIC_THINKING_OUTPUT_HEADROOM = 4096
 
 /**
  * Checks if a model supports adaptive thinking (thinking.type: "adaptive").
- * Fable 5 and Fable 5.1 support ONLY adaptive thinking (always on; type: "disabled" is rejected).
+ * Fable 5, Fable 5.1, and Opus 5.5 support ONLY adaptive thinking (always on; type: "disabled" is rejected).
  * Sonnet 5 supports ONLY adaptive thinking (manual budget_tokens returns a 400 error).
  * Opus 5, Opus 4.8, and Opus 4.7 support ONLY adaptive thinking (no extended thinking / budget_tokens).
  * Opus 4.6 and Sonnet 4.6 support both extended and adaptive thinking — use adaptive.
@@ -169,7 +169,7 @@ function supportsAdaptiveThinking(modelId: string): boolean {
 /**
  * Builds the thinking configuration for the Anthropic API based on model capabilities and level.
  *
- * - Fable 5.1, Fable 5, Sonnet 5, Opus 5, Opus 4.8, Opus 4.7: Uses adaptive thinking only (no extended thinking support)
+ * - Fable 5.1, Fable 5, Sonnet 5, Opus 5.5, Opus 5, Opus 4.8, Opus 4.7: Uses adaptive thinking only (no extended thinking support)
  * - Opus 4.6, Sonnet 4.6: Uses adaptive thinking with effort parameter
  * - Other models: Uses budget_tokens-based extended thinking
  *

diff --git a/apps/sim/providers/models.test.ts b/apps/sim/providers/models.test.ts
@@ -165,7 +165,7 @@ describe('catalog featured model metadata', () => {
 })
 
 describe('forced tool use capability', () => {
-  it.each(['claude-fable-5-1', 'CLAUDE-FABLE-5-1'])(
+  it.each(['claude-fable-5-1', 'CLAUDE-FABLE-5-1', 'claude-opus-5-5'])(
     'disables Force while keeping Auto and None support for %s',
     (model) => {
       expect(getModelCapabilities(model)).toMatchObject({
@@ -209,6 +209,7 @@ describe('Anthropic provider definition', () => {
       anthropic.models.filter((model) => model.sunset?.status === 'legacy').map((model) => model.id)
     ).toEqual([
       'claude-fable-5',
+      'claude-opus-5',
       'claude-opus-4-8',
       'claude-opus-4-7',
       'claude-opus-4-6',

diff --git a/apps/sim/providers/models.ts b/apps/sim/providers/models.ts
@@ -1004,6 +1004,29 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
         releaseDate: '2026-06-30',
         recommended: true,
       },
+      {
+        id: 'claude-opus-5-5',
+        pricing: {
+          input: 4.0,
+          cachedInput: 0.2,
+          output: 20.0,
+          updatedAt: '2026-09-22',
+        },
+        capabilities: {
+          forcedToolUse: false,
+          nativeStructuredOutputs: true,
+          maxOutputTokens: 128000,
+          promptCaching: { minimumCacheableTokens: 512 },
+          thinking: {
+            levels: ['low', 'medium', 'high', 'xhigh', 'max'],
+            default: 'medium',
+            streamed: 'summary',
+          },
+        },
+        contextWindow: 1000000,
+        releaseDate: '2026-09-22',
+        recommended: true,
+      },
       {
         id: 'claude-opus-5',
         pricing: {
@@ -1024,7 +1047,7 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
         },
         contextWindow: 1000000,
         releaseDate: '2026-07-24',
-        recommended: true,
+        sunset: { status: 'legacy' },
       },
       {
         id: 'claude-opus-4-8',