1,258 pages for port.
Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it.
webhooks
Claude Developer Platform · in the page
managed-agents/webhooks
…livering stale data on retries and keeps every delivery small. ## Supported event types <Tabs> <Tab title="Session events"> Some of these events are named differently from the matching events…
workflow-runs
Claude Developer Platform · in the page
managed-agents/workflow-runs
…n still end `completed`, so tell the agent that the session runs to report what failed. When the run ends, the agent that the session runs gets a turn to read what the run did. It can then answer you…
Or, for Claude Mythos 5.1, which offers the same capabilities to verified organizations:
Claude Developer Platform · in the page
models/fable-5-1/migration-guide
…ication programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). For behavioral differences and prompting patterns, see [Prompting Claude Fable 5.1](https:/…
overview
Claude Developer Platform · in the page
models/fable-5-1/overview
…ication programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). If you already call Claude Fable 5, four changes are breaking: [forced tool use returns an…
whats-new-fable-5-1
Claude Developer Platform · in the page
models/fable-5-1/whats-new-fable-5-1
…ication programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). If you already call Claude Fable 5, four changes are breaking: [forced tool use returns an…
overview
Claude Developer Platform · in the page
models/fable-5/overview
…ication programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). It shares Claude Fable 5's specifications and pricing. ## How it compares to the current l…
overview
Claude Developer Platform · in the page
models/haiku-4-5/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
migration-guide
Claude Developer Platform · in the page
models/haiku-5-5/migration-guide
…iority Tier](https://platform.claude.com/docs/en/api/service-tiers#supported-models) commitment on Claude Haiku 4.5, plan capacity separately: Priority Tier is not supported on Claude Haiku 5.5. ###…
overview
Claude Developer Platform · in the page
models/haiku-5-5/overview
…uch as classification, routing, extraction, and subagent tasks. It supports adaptive thinking with the effort parameter, a 1M token context window, and up to 128k output tokens. It uses the same newer…
whats-new-haiku-5-5
Claude Developer Platform · in the page
models/haiku-5-5/whats-new-haiku-5-5
…uch as classification, routing, extraction, and subagent tasks. It supports adaptive thinking with the effort parameter, a 1M token context window, and up to 128k output tokens. It uses the same newer…
overview
Claude Developer Platform · in the page
models/mythos-5-1/overview
…ication programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). It has the same specifications and pricing as Claude Fable 5.1. To request access, apply to…
overview
Claude Developer Platform · in the page
models/mythos-5/overview
…ication programs, such as the [Cyber Verification Program](https://support.claude.com/en/articles/14604842). It has the same specifications and pricing as Claude Fable 5. To request access, apply to t…
overview
Claude Developer Platform · in the page
models/opus-4-5/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
overview
Claude Developer Platform · in the page
models/opus-4-6/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
overview
Claude Developer Platform · in the page
models/opus-4-7/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
overview
Claude Developer Platform · in the page
models/opus-4-8/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
migration-guide
Claude Developer Platform · in the page
models/opus-5-5/migration-guide
…://platform.claude.com/docs/en/about-claude/pricing)). For feature support, see [What's new in Claude Opus 5.5](https://platform.claude.com/docs/en/models/opus-5-5/whats-new-opus-5-5#feature-support).…
overview
Claude Developer Platform · in the page
models/opus-5-5/overview
…/docs/en/models/opus-5-5/whats-new-opus-5-5#forced-tool-use-is-not-supported), [thinking blocks are tied to the model and the conversation](https://platform.claude.com/docs/en/models/opus-5-5/whats-ne…
whats-new-opus-5-5
Claude Developer Platform · in the page
models/opus-5-5/whats-new-opus-5-5
…ts-new-opus-5-5 description: Overview of breaking changes, feature support, and behavior differences in Claude Opus 5.5. --- Claude Opus 5.5 is built for long-running agentic coding and knowledge wor…
overview
Claude Developer Platform · in the page
models/opus-5/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
Models overview
Claude Developer Platform · in the page
models/overview
…ude Opus 5.5 at higher effort still fall short. All current models support text and image input, text output, multilingual capabilities, vision, and tool use. Each model's page lists the platforms it'…
overview
Claude Developer Platform · in the page
models/sonnet-4-5/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
overview
Claude Developer Platform · in the page
models/sonnet-4-6/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
migration-guide
Claude Developer Platform · in the page
models/sonnet-5-5/migration-guide
….claude.com/docs/en/models/sonnet-5-5/whats-new-sonnet-5-5#feature-support) and [Prompting Claude Sonnet 5.5](https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-…
overview
Claude Developer Platform · in the page
models/sonnet-5-5/overview
…s/en/models/sonnet-5-5/whats-new-sonnet-5-5#forced-tool-use-is-not-supported). * [Thinking blocks are tied to the model and the conversation](https://platform.claude.com/docs/en/models/sonnet-5-5/what…
whats-new-sonnet-5-5
Claude Developer Platform · in the page
models/sonnet-5-5/whats-new-sonnet-5-5
…om Claude Sonnet 5 to Claude Sonnet 5.5: breaking changes, feature support, behavior differences, pricing, and availability." --- Claude Sonnet 5.5 offers the best combination of speed and intelligen…
overview
Claude Developer Platform · in the page
models/sonnet-5/overview
…Opus 4.8, Claude Opus 4.7, Claude Opus 4.6, and Claude Sonnet 4.6 support up to 300k output tokens with the output-300k-2026-03-24 beta header. * **Price / MTok:** Input / output, base price per mill…
overview
Claude Developer Platform · in the page
release-notes/overview
…[Release notes for Claude Apps in the Claude Help Center](https://support.claude.com/en/articles/12138966-release-notes). For updates to Claude Code, see the [complete CHANGELOG.md](https://github…
claude-fable-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-fable-5
…laude should tell them it doesn't know, and point them to 'https://support.claude.com'. If the person asks Claude about the Anthropic API, Claude API, or Claude Platform, Claude should point them to…
claude-fable-5-1
Claude Developer Platform · in the page
release-notes/system-prompts/claude-fable-5-1
…laude should tell them it doesn't know, and point them to 'https://support.claude.com'. If the person asks Claude about the Anthropic API, Claude API, or Claude Platform, Claude should point them to…
claude-haiku-3-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-3-5
…laude should tell them it doesn't know, and point them to "https://support.claude.com". If the human asks Claude about the Anthropic API, Claude API, or Claude Developer Platform, Claude should point…
claude-haiku-4-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-4-5
…ed access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026 (Anthropic's s…
claude-haiku-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-haiku-5-5
…ed access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026 (Anthropic's s…
claude-opus-4
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4
…laude should tell them it doesn't know, and point them to 'https://support.anthropic.com'. If the person asks Claude about the Anthropic API, Claude should point them to 'https://docs.anthropic.com'.…
claude-opus-4-1
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-1
…laude should tell them it doesn't know, and point them to 'https://support.anthropic.com'. If the person asks Claude about the Anthropic API, Claude should point them to 'https://docs.anthropic.com'.…
claude-opus-4-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-5
…laude should tell them it doesn't know, and point them to 'https://support.claude.com'. If the person asks Claude about the Anthropic API, Claude API, or Claude Developer Platform, Claude should poin…
claude-opus-4-6
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-6
…laude should tell them it doesn't know, and point them to 'https://support.claude.com'. If the person asks Claude about the Anthropic API, Claude API, or Claude Developer Platform, Claude should poin…
claude-opus-4-7
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-7
…laude should tell them it doesn't know, and point them to 'https://support.claude.com'. If the person asks Claude about the Anthropic API, Claude API, or Claude Platform, Claude should point them to…
claude-opus-4-8
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-4-8
…or Anthropic), Claude says it doesn't know and points to 'https://support.claude.com'. For Anthropic API, Claude API, or Claude Platform questions, Claude points to 'https://docs.claude.com'. When…
claude-opus-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-5
…ed access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026 (Anthropic's s…
claude-opus-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-opus-5-5
…ed access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026 (Anthropic's s…
claude-sonnet-3-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-3-5
…s explicitly stated in the message, quoting the human's message to support the existence of each constraint. Sometimes Claude can accidentally overlook minor changes to well-known puzzles and get them…
claude-sonnet-3-7
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-3-7
…laude should tell them it doesn't know, and point them to 'https://support.anthropic.com'. If the person asks Claude about the Anthropic API, Claude should point them to 'https://docs.anthropic.com/e…
claude-sonnet-4
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-4
…laude should tell them it doesn't know, and point them to 'https://support.anthropic.com'. If the person asks Claude about the Anthropic API, Claude should point them to 'https://docs.anthropic.com'.…
claude-sonnet-4-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-4-5
…laude should tell them it doesn't know, and point them to 'https://support.claude.com'. If the person asks Claude about the Anthropic API, Claude API, or Claude Developer Platform, Claude should poin…
claude-sonnet-4-6
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-4-6
…or Anthropic), Claude says it doesn't know and points to 'https://support.claude.com'. For Anthropic API, Claude API, or Claude Platform questions, Claude points to 'https://docs.claude.com'. When…
claude-sonnet-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-5
…hos 5 and Claude Fable 5 is temporarily suspended in response to an export control directive. See https://www.anthropic.com/news/fable-mythos-access. If asked for more details, Claude should acknowled…
claude-sonnet-5-5
Claude Developer Platform · in the page
release-notes/system-prompts/claude-sonnet-5-5
…ed access to both models to comply with U.S. Department of Commerce export controls; the Department lifted those controls on June 30, 2026, and Anthropic restored access on July 1, 2026 (Anthropic's s…
develop-tests
Claude Developer Platform · in the page
test-and-evaluate/develop-tests
…### Common success criteria Here are some criteria that might be important for your use case. This list is non-exhaustive. <AccordionGroup> <Accordion title="Task fidelity"> How well does th…
handle-streaming-refusals
Claude Developer Platform · in the page
test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
…Err(); err != nil { log.Fatal(err) } ``` ```java Java import com.anthropic.core.http.StreamResponse; import com.anthropic.models.messages.RawMessageStreamEvent; import com.anthropic.…