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One read of Claude Developer Platformapi-20261022T020713Z

168 pages moved out of 808 read.

Pages moved 168 significant first
Pages read 808 in this capture
Captured 02:07 UTC
Corpus hash f3f082ef7981 index-hash

What this read moved

151-168 of 168, page 7 of 7

This capture is too large to show at once. Changes 151-168 of 168 are below, significant first; the rest are on the following screens.

release-notes/system-prompts/claude-opus-4 Changed · +1 / -1 lines

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11---
22title: Claude Opus 4 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-4
4description: See updates to the core system prompt for Claude Opus 4 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 4 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## August 5, 2025

release-notes/system-prompts/claude-opus-4-1 Changed · +1 / -1 lines

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11---
22title: Claude Opus 4.1 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-4-1
4description: See updates to the core system prompt for Claude Opus 4.1 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 4.1 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## August 5, 2025

release-notes/system-prompts/claude-opus-4-5 Changed · +1 / -1 lines

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11---
22title: Claude Opus 4.5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-4-5
4description: See updates to the core system prompt for Claude Opus 4.5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 4.5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
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77Changes between the following dated versions are marked with `**` around the changed text.

release-notes/system-prompts/claude-opus-4-6 Changed · +1 / -1 lines

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11---
22title: Claude Opus 4.6 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-4-6
4description: See updates to the core system prompt for Claude Opus 4.6 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 4.6 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
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66 
77## February 5, 2026

release-notes/system-prompts/claude-opus-4-7 Changed · +1 / -1 lines

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11---
22title: Claude Opus 4.7 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-4-7
4description: See updates to the core system prompt for Claude Opus 4.7 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 4.7 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
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66 
77## April 16, 2026

release-notes/system-prompts/claude-opus-4-8 Changed · +1 / -1 lines

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11---
22title: Claude Opus 4.8 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-4-8
4description: See updates to the core system prompt for Claude Opus 4.8 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 4.8 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## May 28, 2026

release-notes/system-prompts/claude-opus-5 Changed · +1 / -1 lines

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11---
22title: Claude Opus 5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-5
4description: See updates to the core system prompt for Claude Opus 5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## July 24, 2026

release-notes/system-prompts/claude-opus-5-5 Changed · +1 / -1 lines

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11---
22title: Claude Opus 5.5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-opus-5-5
4description: See updates to the core system prompt for Claude Opus 5.5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Opus 5.5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
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66 
77## September 22, 2026

release-notes/system-prompts/claude-sonnet-3-5 Changed · +1 / -1 lines

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11---
22title: Claude Sonnet 3.5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-3-5
4description: See updates to the core system prompt for Claude Sonnet 3.5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 3.5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
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77Changes between the following dated versions are marked with `**` around the changed text.

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22title: Claude Sonnet 3.7 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-3-7
4description: See updates to the core system prompt for Claude Sonnet 3.7 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 3.7 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## February 24, 2025

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11---
22title: Claude Sonnet 4 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-4
4description: See updates to the core system prompt for Claude Sonnet 4 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 4 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## August 5, 2025

release-notes/system-prompts/claude-sonnet-4-5 Changed · +1 / -1 lines

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11---
22title: Claude Sonnet 4.5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-4-5
4description: See updates to the core system prompt for Claude Sonnet 4.5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 4.5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77Changes between the following dated versions are marked with `**` around the changed text.

release-notes/system-prompts/claude-sonnet-4-6 Changed · +1 / -1 lines

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11---
22title: Claude Sonnet 4.6 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-4-6
4description: See updates to the core system prompt for Claude Sonnet 4.6 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 4.6 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## October 7, 2026

release-notes/system-prompts/claude-sonnet-5 Changed · +1 / -1 lines

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11---
22title: Claude Sonnet 5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5
4description: See updates to the core system prompt for Claude Sonnet 5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77## June 30, 2026

release-notes/system-prompts/claude-sonnet-5-5 Changed · +1 / -1 lines

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11---
22title: Claude Sonnet 5.5 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-sonnet-5-5
4description: See updates to the core system prompt for Claude Sonnet 5.5 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Sonnet 5.5 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
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77## October 7, 2026

release-notes/system-prompts/overview Changed · +1 / -1 lines

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22title: System prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/overview
4description: See updates to the core system prompts on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompts on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
55---
66 
77Claude's web interface ([claude.ai](https://claude.ai)) and mobile apps use a system prompt to provide up-to-date information, such as the current date, to Claude at the start of every conversation. The system prompt also encourages certain behaviors, such as always providing code snippets in Markdown. This prompt is periodically updated to improve Claude's responses. These system prompt updates do not apply to the Claude API. Some models have multiple dated entries on their pages.

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

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1414 
1515When streaming classifiers detect content that violates Anthropic's policies, the API returns this response:
1616 
17```json
17```text
1818{
1919 "role": "assistant",
2020 "content": [

test-and-evaluate/strengthen-guardrails/increase-consistency Changed · +1 / -1 lines

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316316 
317317## Chain prompts for complex tasks
318318 
319Break down complex tasks into smaller, consistent subtasks. Each subtask gets Claude's full attention, reducing inconsistency errors across scaled workflows.
319Break down complex tasks into smaller, consistent subtasks. Each prompt then covers a single subtask, reducing inconsistency errors across scaled workflows.
320320 
321321## Keep Claude in character
322322 
Feedback