Claude Developer Platform documentation
808 pages as of the newest read. Every one links to its own history: what it said before, and what changed when.
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test-and-evaluate/strengthen-guardrails/increase-consistency
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test-and-evaluate/strengthen-guardrails/increase-consistency
Break down complex tasks into smaller, consistent subtasks. Each subtask gets Claude's full attention, reducing inconsistency errors across scaled workflows.
Break down complex tasks into smaller, consistent subtasks. Each prompt then covers a single subtask, reducing inconsistency errors across scaled workflows.
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test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
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test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
```json
```text
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test-and-evaluate/develop-tests
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test-and-evaluate/develop-tests
| | Criteria
| ---- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Bad | The model should classify sentiments well
| Good | On a held-out test set of 10,000 diverse Twitter posts, the sentiment analysis model should achieve:<br />- an F1 score of at least 0.85<br />- 99.5% of outputs are non-
| | Criteria
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release-notes/system-prompts/overview
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release-notes/system-prompts/overview
description: 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
description: 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://anthrop
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release-notes/system-prompts/claude-sonnet-5-5
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release-notes/system-prompts/claude-sonnet-5-5
description: 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 a
description: 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
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release-notes/system-prompts/claude-sonnet-5
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release-notes/system-prompts/claude-sonnet-5
description: 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
description: 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 a
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release-notes/system-prompts/claude-sonnet-4-6
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release-notes/system-prompts/claude-sonnet-4-6
description: 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 a
description: 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
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release-notes/system-prompts/claude-sonnet-4-5
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release-notes/system-prompts/claude-sonnet-4-5
description: 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 a
description: 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
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release-notes/system-prompts/claude-sonnet-4
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release-notes/system-prompts/claude-sonnet-4
description: 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
description: 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 a
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release-notes/system-prompts/claude-sonnet-3-7
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release-notes/system-prompts/claude-sonnet-3-7
description: 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 a
description: 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
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release-notes/system-prompts/claude-sonnet-3-5
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release-notes/system-prompts/claude-sonnet-3-5
description: 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 a
description: 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
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release-notes/system-prompts/claude-opus-5-5
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release-notes/system-prompts/claude-opus-5-5
description: 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
description: 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 a
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release-notes/system-prompts/claude-opus-5
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release-notes/system-prompts/claude-opus-5
description: 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](
description: 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
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release-notes/system-prompts/claude-opus-4-8
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release-notes/system-prompts/claude-opus-4-8
description: 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
description: 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 a
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release-notes/system-prompts/claude-opus-4-7
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release-notes/system-prompts/claude-opus-4-7
description: 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
description: 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 a
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