One read of Claude Developer Platformapi-20260925T153714Z

This capture is too large to show at once. Changes 301-310 of 310 are below, significant first; the rest are on the following screens.

models/haiku-4-5/overview Changed · +1 / -1 lines

from line 105

105105## Reference

106106 

107107<CardGroup cols={3}>

108 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-haiku-4-5">

108 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-haiku-4-5">

109109 The system prompt Claude Haiku 4.5 uses on claude.ai and the Claude apps.

110110 </Card>

111111 

models/opus-4-5/overview Changed · +1 / -1 lines

from line 93

9393## Reference

9494 

9595<CardGroup cols={3}>

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-5">

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-5">

9797 The system prompt Claude Opus 4.5 uses on claude.ai and the Claude apps.

9898 </Card>

9999 

models/opus-4-6/overview Changed · +1 / -1 lines

from line 93

9393## Reference

9494 

9595<CardGroup cols={3}>

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-6">

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-6">

9797 The system prompt Claude Opus 4.6 uses on claude.ai and the Claude apps.

9898 </Card>

9999 

models/opus-4-7/overview Changed · +1 / -1 lines

from line 93

9393## Reference

9494 

9595<CardGroup cols={3}>

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-7">

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-7">

9797 The system prompt Claude Opus 4.7 uses on claude.ai and the Claude apps.

9898 </Card>

9999 

models/opus-4-8/overview Changed · +1 / -1 lines

from line 95

9595## Reference

9696 

9797<CardGroup cols={3}>

98 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-4-8">

98 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-4-8">

9999 The system prompt Claude Opus 4.8 uses on claude.ai and the Claude apps.

100100 </Card>

101101 

models/opus-5-5/whats-new-opus-5-5 Changed · +1 / -1 lines

from line 88

8888 

8989## Refusals and fallback

9090 

91Claude Opus 5.5 ships with safety classifiers, and everything in [Refusals and fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) applies. A declined request returns HTTP 200 with `stop_reason: "refusal"` and a [`stop_details`](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#refusal-response) object naming the policy area, so handle refusals and configure fallback: retry on another model with [server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#server-side-fallback) (`fallbacks: "default"`, in beta, retries on the model Anthropic recommends for that category), the [SDK middleware](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#client-side-fallback), or your own retry.

91Claude Opus 5.5 ships with safety classifiers, and everything in [Refusals and fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback) applies. A declined request returns HTTP 200 with `stop_reason: "refusal"` and a [`stop_details`](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#refusal-response) object naming the policy area, so handle refusals and configure fallback: retry on another model with [server-side fallback](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#server-side-fallback) (`fallbacks: "default"`, in beta, retries on the model Anthropic recommends for that category), the [SDK middleware](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#client-side-fallback), or your own retry. Whether a refusal that arrives before any output is billed depends on its refusal category, and it counts against your rate limits either way; see [How refusals are billed](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#how-refusals-are-billed).

9292 

9393## Pricing

9494 

models/opus-5/overview Changed · +1 / -1 lines

from line 103

103103## Reference

104104 

105105<CardGroup cols={3}>

106 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-opus-5">

106 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-opus-5">

107107 The system prompt Claude Opus 5 uses on claude.ai and the Claude apps.

108108 </Card>

109109 

models/sonnet-4-5/overview Changed · +1 / -1 lines

from line 93

9393## Reference

9494 

9595<CardGroup cols={3}>

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-sonnet-4-5">

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-sonnet-4-5">

9797 The system prompt Claude Sonnet 4.5 uses on claude.ai and the Claude apps.

9898 </Card>

9999 

models/sonnet-4-6/overview Changed · +1 / -1 lines

from line 93

9393## Reference

9494 

9595<CardGroup cols={3}>

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts#claude-sonnet-4-6">

96 <Card title="System prompt" icon="text" href="https://platform.claude.com/docs/en/release-notes/system-prompts/overview#claude-sonnet-4-6">

9797 The system prompt Claude Sonnet 4.6 uses on claude.ai and the Claude apps.

9898 </Card>

9999 

test-and-evaluate/strengthen-guardrails/handle-streaming-refusals Changed · +1 / -3 lines

from line 45

4545When you receive **`stop_reason`: `refusal`**, you must reset the conversation context before continuing. You can remove or rephrase the turn that triggered the refusal, or clear the conversation history entirely. Attempting to continue without resetting will result in continued refusals.

4646 

4747<Note>

48 Usage metrics are still provided in the response, even when the response is refused.

49 

50 When a refusal arrives before Claude generates any output, you are not billed for the request on the Claude API, and the usage counts in that response are informational only. When Claude generates output before the refusal, you are billed for that request.

48 Usage metrics are still provided in the response, even when the response is refused. Whether a refused request is billed depends on when the refusal arrives and its category; see [How refusals are billed](https://platform.claude.com/docs/en/build-with-claude/refusals-and-fallback#how-refusals-are-billed).

5149</Note>

5250 

5351<Tip>