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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-5-1 Claude Developer Platform · in the page release-notes/system-prompts/claude-fable-5-1 …nnet 5, and Claude Haiku 4.5, with model strings 'claude-fable-5-1', 'claude-opus-5', 'claude-sonnet-5', and 'claude-haiku-4-5-20251001'. The person is able to switch models mid-conversation, so previ…

claude-haiku-4-5 Claude Developer Platform · in the page release-notes/system-prompts/claude-haiku-4-5 …ku 5.5, and Claude Haiku 4.5, with model strings 'claude-fable-5-1', 'claude-opus-5-5', 'claude-sonnet-5-5', 'claude-haiku-5-5', and 'claude-haiku-4-5-20251001'. Above Opus sits Anthropic's new Mytho…

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-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-5-5 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 …s=messages + [{"role": "user", "content": "Hello"}], model="claude-opus-5-5", ) as stream: for event in stream: # Check for refusal in message delta…

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…

Configure your agent Claude Code CLI · in the page agent-sdk/configuration …{null} const options = { model: "claude-fable-5", fallbackModel: "claude-opus-5,claude-sonnet-5", }; ``` ```python Python theme={null} options = ClaudeAgentOptions( model="claude-fable-5",…

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…

Subagents in the SDK Claude Code CLI · in the page agent-sdk/subagents …orm.claude.com/docs/en/build-with-claude/prompt-engineering/prompting-claude-opus-5#controlling-subagent-spawning) has a delegation instruction you can add to any prompt. Whether Claude Code adds an i…

Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …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…

Model configuration Claude Code CLI · in the page model-config …. To pin to a specific version, use the full model name, for example `claude-opus-5-5`, or set the corresponding environment variable like `ANTHROPIC_DEFAULT_OPUS_MODEL`. > [!NOTE] > > Sonnet 5.5 req…

All settings Claude Code CLI · in the page settings-reference …nt default version of that model family, or a full model ID such as `"claude-opus-5-5"` * **Default**: unset, so the advisor is off * **Per-session overrides**: `--advisor` takes precedence over this…

Customize your status line Claude Code CLI · in the page statusline …cript_path": "/path/to/transcript.jsonl", > "model": { > "id": "claude-opus-5-5", > "display_name": "Opus" > }, > "workspace": { > "current_dir": "/current/working/directory", >…

Create custom subagents Claude Code CLI · in the page sub-agents …to use: `sonnet`, `opus`, `haiku`, `fable`, a full model ID such as `claude-opus-5-5`, or `inherit`. When you omit it, Claude Code picks the model in the [subagent model order](#choose-a-model) | | `…

Week 30 · July 20–24, 2026 Claude Code CLI · in the page whats-new/2026-w30 …it from the model picker: ```text Claude Code theme={null} > /model claude-opus-5 ``` [Model configuration](/docs/en/model-config.md#available-models) iOS Simulator in Claude Code Desktop Desktop…

Personal connectors in channels Claude Documentation · in the page claude-tag/concepts/personal-connectors …ctors](/docs/claude-tag/users/troubleshooting.md#claude-says-it-needs-claude-opus-5-to-use-my-personal-connectors). ### Stop connector use To stop a task that's using your connectors, select **Stop*…

Commands Claude Tag understands Claude Documentation · in the page claude-tag/users/commands …``text wrap theme={null} Fast mode is on for this thread. Switched to claude-opus-5-5, since the previous model has no fast mode. ``` If the session was on another model, such as Sonnet, and the repl…

Deploy with a bootstrap server Claude Documentation · in the page third-party/claude-desktop/bootstrap …["claude-sonnet-5"] }, power: { ...BASE, inferenceModels: ["claude-opus-5", "claude-sonnet-5"], coworkEgressAllowedHosts: ["pypi.org", "registry.npmjs.org"], }, }; const ENTITLED_ROLES…

Configuration implementation Claude Documentation · in the page third-party/claude-desktop/configuration-format …[] (JSON) | JSON array **encoded as a string** | `["claude-sonnet-5","claude-opus-5"]` | | enum\[] (JSON) | JSON array of values the key's entry lists, **encoded as a string** | `["userPrompts","toolD…

Deploy Claude Desktop on 3P with an LLM gateway Claude Documentation · in the page third-party/claude-desktop/gateway …the model IDs your gateway expects (for example `bedrock/us.anthropic.claude-opus-5` for a LiteLLM-style routing prefix). Your gateway can mark which Claude tier a model serves by returning an `anthr…

Models and effort levels Claude Documentation · in the page third-party/claude-desktop/models …d as a model with a native 1M context window**, such as `us.anthropic.claude-opus-5`: you don't need `supports1m` or `prefer1m`. Setting them doesn't change the assumed window. For earlier Claude Desk…

Build an MCP client Model Context Protocol · in the page docs/2026-07-28/develop/build-client …tenv load_dotenv() # load environment variables from .env MODEL = "claude-opus-5" anthropic = Anthropic() ``` `Client` is the single object your program talks to the server through. Listing the to…

Build an MCP client Model Context Protocol · in the page docs/draft/develop/build-client …tenv load_dotenv() # load environment variables from .env MODEL = "claude-opus-5" anthropic = Anthropic() ``` `Client` is the single object your program talks to the server through. Listing the to…