Documentation update

Models & pricing

• New docs for Claude Fable 5, Claude Mythos 5, Claude Opus 4.8, and Claude Sonnet 5, including what’s new and model-specific prompting guidance
• Added models overview, choosing a model, model IDs and versioning, upgrade/migration guide, model deprecations, and pricing
• Added glossary

Use case guides

• New guides overview plus docs for classification, content moderation, customer support agents, legal summarization, and ticket routing

API reference

• Expanded API docs: overview, errors, rate limits, service tiers, supported regions, versions, beta headers, and IP addresses
• Added Claude Platform on AWS IAM actions
• Added API docs to trigger a routine
• Admin API key page title clarified to “Retrieve API Key (Admin API)”

Prompt engineering

• New prompt engineering overview, prompting best practices, Console prompting tools, and model-specific prompting pages (Fable 5, Opus 4.8, Sonnet 5)

CLI, SDKs, and libraries

• New section overview covering CLI, SDKs, and libraries
• CLI: quickstart, authentication options, using the CLI, scripting and automation
• SDKs: Python, TypeScript, Java, Go, C#, PHP, Ruby
• Libraries and related: OpenAI SDK compatibility, Apple Foundation Models, SDK middleware
• Added API usage primer and Claude API skill overview

Test and evaluate

• Docs for defining success criteria and building evaluations, and using the Evaluation Tool in Console
• Guardrails guidance: increase output consistency, mitigate jailbreaks, reduce hallucinations, reduce latency, and reduce prompt leak

Release notes & resources

• Added Claude Platform release notes overview and system prompts
• Added model cards / resources overview

No documentation pages were removed in this update.