257 pages for claude-opus-5-5.

reference Claude Developer Platform · in the page managed-agents/reference …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… scheduled-deployments Claude Developer Platform · in the page managed-agents/scheduled-deployments …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… secure-deployment Claude Developer Platform · in the page managed-agents/secure-deployment …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… secure-deployment-monitoring Claude Developer Platform · in the page managed-agents/secure-deployment-monitoring …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… secure-deployment-risks Claude Developer Platform · in the page managed-agents/secure-deployment-risks …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… spawn.sh: called once per claimed work item Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes …name="Internal tools agent", model="claude-opus-5-5", tools=[ {"type": "agent_toolset_20260401"}, *[to_c… self-hosted-sandboxes-custom-tools Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-custom-tools …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… self-hosted-sandboxes-memory Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-memory …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… self-hosted-sandboxes-operations Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-operations …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… self-hosted-sandboxes-reference Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-reference …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… self-hosted-sandboxes-security Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-security …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… self-hosted-sandboxes-workers Claude Developer Platform · in the page managed-agents/self-hosted-sandboxes-workers …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… inference-provider Claude Developer Platform · in the page managed-agents/self-hosted/inference-provider …hose variables. Agents name models by their Claude API IDs, such as `claude-opus-5-5`. The server translates the ID, so an agent definition works unchanged under any provider that serves that model.… quickstart Claude Developer Platform · in the page managed-agents/self-hosted/quickstart …kdown --- name: Quickstart agent model: claude-opus-5-5 tools: - type: agent_toolset_20260401 --- You are a helpful assistant.… session-observability Claude Developer Platform · in the page managed-agents/session-observability …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… session-operations Claude Developer Platform · in the page managed-agents/session-operations …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… session-threads Claude Developer Platform · in the page managed-agents/session-threads …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… sessions Claude Developer Platform · in the page managed-agents/sessions …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… skills Claude Developer Platform · in the page managed-agents/skills …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… tools Claude Developer Platform · in the page managed-agents/tools …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… tools-web-restrictions Claude Developer Platform · in the page managed-agents/tools-web-restrictions …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… vaults Claude Developer Platform · in the page managed-agents/vaults …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… webhooks Claude Developer Platform · in the page managed-agents/webhooks …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… workflow-runs Claude Developer Platform · in the page managed-agents/workflow-runs …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… migration-guide Claude Developer Platform · in the page models/fable-5-2/migration-guide …nto Claude Fable 5.2. ### Update your model name ```python model = "claude-opus-5-5" # Before model = "claude-fable-5-2" # After ``` ### What changes 1. **Data retention is required:** Claude Fa… migration-guide Claude Developer Platform · in the page models/opus-5-5/migration-guide …igrate your code for you ```text /claude-api migrate this project to claude-opus-5-5 ``` This page lists the code changes for moving to Claude Opus 5.5 from [Claude Opus 5](https://platform.claude.c… overview Claude Developer Platform · in the page models/opus-5-5/overview …2026. For long-running agentic coding and knowledge work Model ID: `claude-opus-5-5` Context window: 1M tokens · Max output: 128K tokens · Input pricing: $4 / MTok · Output pricing: $20 / MTok [An… whats-new-opus-5-5 Claude Developer Platform · in the page models/opus-5-5/whats-new-opus-5-5 …----------------------------------------------- | | Claude Opus 5.5 | claude-opus-5-5 | For long-running agentic coding and knowledge work | [Adaptive thinking](https://platform.claude.com/docs/en/bu… Models overview Claude Developer Platform · in the page models/overview …-2` | `claude-opus-5-5` | `claude-sonnet-5-5`… overview Claude Developer Platform · in the page release-notes/overview …ject. ### September 22, 2026 * We’ve launched **Claude Opus 5.5** (`claude-opus-5-5`), a model for long-running agentic coding and knowledge work. It has a [1M token context window](https://platform… claude-fable-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5 …Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-fable-5', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. The person is able to switch models mid-conversation, so previous m… claude-fable-5-1 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5-1 …et 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. The person is able to switch models mid-conversation, so previous m… claude-fable-5-2 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5-2 …et 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-2', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Above Opus sits Anthropic's new Mythos tier. The first Mythos-clas… claude-haiku-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-4-5 …et 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Claude Haiku 4.5 (this model, 'claude-haiku-4-5-20251001') is from… claude-haiku-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-5-5 …et 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Above Opus sits Anthropic's new Mythos tier. The first Mythos-clas… claude-opus-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-6 …Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Claude Opus 4.6 (this model, 'claude-opus-4-6') is from an earlier… claude-opus-4-7 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-7 …Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Claude Opus 4.7 (this model, 'claude-opus-4-7') is from an earlier… claude-opus-4-8 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-4-8 …Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Claude Opus 4.8 (the currently selected model, 'claude-opus-4-8') i… claude-opus-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-opus-5 …Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-opus-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Above Opus sits Anthropic's new Mythos tier. The… claude-sonnet-4-6 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-4-6 …Claude Haiku 5.5. They use the API model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Claude Sonnet 4.6 (this model, 'claude-sonnet-4-6') is from an earl… claude-sonnet-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5 …nnet 5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', 'claude-sonnet-5', and 'claude-haiku-5-5'. Above Opus sits Anthropic's new Mythos tier. Th… claude-sonnet-5-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-sonnet-5-5 …et 5.5, and Claude Haiku 5.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', and 'claude-haiku-5-5'. Above Opus sits Anthropic's new Mythos tier. The first Mythos-clas… overview Claude Developer Platform · in the page release-notes/system-prompts/overview …cs/en/release-notes/system-prompts/claude-sonnet-5-5" /> <Card id="claude-opus-5-5" title="Claude Opus 5.5" icon="file" href="https://platform.claude.com/docs/en/release-notes/system-prompts/claude… overview Claude Developer Platform · in the page resources/overview …ude Opus 5.5 System Card" icon="file" href="https://www.anthropic.com/claude-opus-5-5-system-card"> Detailed documentation of Claude Opus 5.5. </Card> <Card title="Claude Fable 5.1 and Mythos… develop-tests Claude Developer Platform · in the page test-and-evaluate/develop-tests …tr): message = client.messages.create( model="claude-opus-5-5", max_tokens=1024, messages=[{"role": "user", "content": prompt}], )… handle-streaming-refusals Claude Developer Platform · in the page test-and-evaluate/strengthen-guardrails/handle-streaming-refusals …laude-fable-5 - claude-mythos-5 - claude-mythos-preview - claude-opus-5-5 - claude-opus-5 - claude-sonnet-5-5 - claude-sonnet-5 - claude-haiku-5-5 - claude-haiku-4-5-20… Escalate hard decisions with the advisor tool Claude Code CLI · in the page advisor …new Claude Code releases. You can also pass a full model ID such as `claude-opus-5-5` or `claude-haiku-5-5`. Haiku 4.5 can call the advisor but can't act as one. Subagents inherit the configured adv… Agent SDK reference - Python Claude Code CLI · in the page agent-sdk/python …en/model-config.md#extended-context), such as `claude-sonnet-5-5` or `claude-opus-5-5`. For a model that reaches 1M only through its `[1m]` variant, append the suffix to the model ID, as in `claude-op… Claude Code on Amazon Bedrock Claude Code CLI · in the page amazon-bedrock …D you pinned | | `ANTHROPIC_BEDROCK_REGION_PREFIX=eu` | `eu.anthropic.claude-opus-5-5`, the built-in default with your preferred prefix | For current and legacy model IDs, see [Models overview](https… Claude Code GitHub Actions Claude Code CLI · in the page github-actions …commits and open issues" claude_args: | --model claude-opus-5-5 --allowedTools "mcp__github__list_commits,mcp__github__list_issues" ``` ## Best practices ### Define…