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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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50 pages for xhigh.

Titles and paths first, then pages whose text carries it. Each row opens that page as this site last read it. Cut at 50, so a narrower query shows the rest.

choosing-a-model Claude Developer Platform · in the page about-claude/models/choosing-a-model …own based on your evals. On Claude Opus 4.8 and Claude Opus 4.7, the `xhigh` effort level, between `high` and `max`, is the best setting for most coding and agentic use cases. Knowing these answers i… Or, for the model with the same capabilities and no access approval requirement: Claude Developer Platform · in the page about-claude/models/migration-guide …4.8, the recommendation for coding and high-autonomy work is to set `xhigh` explicitly. On `claude-fable-5` and `claude-mythos-5`, use `high` as the default for most tasks and reserve `xhigh` for the… optimizing-for-cost-and-intelligence Claude Developer Platform · in the page about-claude/models/optimizing-for-cost-and-intelligence …et `max_tokens` to 64,000 for agentic work (128,000, the maximum, at `xhigh` or `max` effort), [stream responses](https://platform.claude.com/docs/en/build-with-claude/streaming) that large, treat [`s… claude-api-skill Claude Developer Platform · in the page agents-and-tools/agent-skills/claude-api-skill …target model (for example, the default `high` on Claude Opus 5, and `xhigh` for coding and agentic use cases on Claude Opus 4.8 and Claude Opus 4.7) * **Prompt-behavior tuning**, flagging length-cont… Beta Claude Developer Platform · in the page api/beta …Whether this capability is supported by the model. - `xhigh: BetaCapabilitySupport or null` Indicates whether a capability is supported. - `image_input: BetaCapabilitySup… Agents Claude Developer Platform · in the page api/beta/agents …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `BetaManagedAgentsEffortLow object` Low effort. Favors latency over reasoning depth.… Archive Agent Claude Developer Platform · in the page api/beta/agents/archive …ing depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManagedAgents… Create Agent Claude Developer Platform · in the page api/beta/agents/create …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `BetaManagedAgentsEffortLow object` Low effort. Favors latency over reasoning depth.… List Agents Claude Developer Platform · in the page api/beta/agents/list …ing depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManagedAgents… Get Agent Claude Developer Platform · in the page api/beta/agents/retrieve …ing depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManagedAgents… Update Agent Claude Developer Platform · in the page api/beta/agents/update …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `BetaManagedAgentsEffortLow object` Low effort. Favors latency over reasoning depth.… Versions Claude Developer Platform · in the page api/beta/agents/versions …ing depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManagedAgents… List Agent Versions Claude Developer Platform · in the page api/beta/agents/versions/list …ing depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManagedAgents… Messages Claude Developer Platform · in the page api/beta/messages …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional BetaJSONOutputFormat or null` A schema to specify Claude's output f… Batches Claude Developer Platform · in the page api/beta/messages/batches …"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional BetaJSONOutputFormat or null` A schema to specify Claud… Create a Message Batch Claude Developer Platform · in the page api/beta/messages/batches/create …"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional BetaJSONOutputFormat or null` A schema to specify Claud… Count tokens in a Message Claude Developer Platform · in the page api/beta/messages/count_tokens …ort levels. - `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional BetaJSONOutputFormat or null` A schema to specify Claude's output format in res… Create a Message Claude Developer Platform · in the page api/beta/messages/create …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional BetaJSONOutputFormat or null` A schema to specify Claude's output f… Models Claude Developer Platform · in the page api/beta/models …Whether this capability is supported by the model. - `xhigh: BetaCapabilitySupport or null` Indicates whether a capability is supported. - `image_input: BetaCapabilitySup… List Models Claude Developer Platform · in the page api/beta/models/list …Whether this capability is supported by the model. - `xhigh: BetaCapabilitySupport or null` Indicates whether a capability is supported. - `image_input: BetaCapabilitySup… Get a Model Claude Developer Platform · in the page api/beta/models/retrieve …Whether this capability is supported by the model. - `xhigh: BetaCapabilitySupport or null` Indicates whether a capability is supported. - `image_input: BetaCapabilitySup… Sessions Claude Developer Platform · in the page api/beta/sessions …"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `BetaManagedAgentsEffortLow object` Low effort. Favors latency over reaso… Archive Session Claude Developer Platform · in the page api/beta/sessions/archive …depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManaged… Create Session Claude Developer Platform · in the page api/beta/sessions/create …"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `BetaManagedAgentsEffortLow object` Low effort. Favors latency over reaso… Events Claude Developer Platform · in the page api/beta/sessions/events …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… List Events Claude Developer Platform · in the page api/beta/sessions/events/list …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… Stream Events Claude Developer Platform · in the page api/beta/sessions/events/stream …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… List Sessions Claude Developer Platform · in the page api/beta/sessions/list …depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManaged… Get Session Claude Developer Platform · in the page api/beta/sessions/retrieve …depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManaged… Threads Claude Developer Platform · in the page api/beta/sessions/threads …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… Archive Session Thread Claude Developer Platform · in the page api/beta/sessions/threads/archive …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… Events Claude Developer Platform · in the page api/beta/sessions/threads/events …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… List Session Thread Events Claude Developer Platform · in the page api/beta/sessions/threads/events/list …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… Stream Session Thread Events Claude Developer Platform · in the page api/beta/sessions/threads/events/stream …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… List Session Threads Claude Developer Platform · in the page api/beta/sessions/threads/list …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… Get Session Thread Claude Developer Platform · in the page api/beta/sessions/threads/retrieve …h. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaM… Update Session Claude Developer Platform · in the page api/beta/sessions/update …depth. - `type: "high"` - `BetaManagedAgentsEffortXhigh object` Extra-high effort. Not all models accept this level. - `type: "xhigh"` - `BetaManaged… Messages Claude Developer Platform · in the page api/messages …ort levels. - `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional JSONOutputFormat or null` A schema to specify Claude's output format in respons… Batches Claude Developer Platform · in the page api/messages/batches …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional JSONOutputFormat or null` A schema to specify Claude's output forma… Create a Message Batch Claude Developer Platform · in the page api/messages/batches/create …- `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional JSONOutputFormat or null` A schema to specify Claude's output forma… Count tokens in a Message Claude Developer Platform · in the page api/messages/count_tokens …ort levels. - `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional JSONOutputFormat or null` A schema to specify Claude's output format in respons… Create a Message Claude Developer Platform · in the page api/messages/create …ort levels. - `"low"` - `"medium"` - `"high"` - `"xhigh"` - `"max"` - `format: optional JSONOutputFormat or null` A schema to specify Claude's output format in respons… Models Claude Developer Platform · in the page api/models …Whether this capability is supported by the model. - `xhigh: CapabilitySupport or null` Indicates whether a capability is supported. - `image_input: CapabilitySupport`… List Models Claude Developer Platform · in the page api/models/list …Whether this capability is supported by the model. - `xhigh: CapabilitySupport or null` Indicates whether a capability is supported. - `image_input: CapabilitySupport`… Get a Model Claude Developer Platform · in the page api/models/retrieve …Whether this capability is supported by the model. - `xhigh: CapabilitySupport or null` Indicates whether a capability is supported. - `image_input: CapabilitySupport`… effort Claude Developer Platform · in the page build-with-claude/effort …t possible reasoning and most thorough analysis | | `xhigh` | Extended capability for long-horizon work. Available on Claude Fable 5, Claude Mythos 5, Claude Opus 5, Claude Opus 4.8,… mid-conversation-effort-example Claude Developer Platform · in the page build-with-claude/mid-conversation-effort-example …/platform.claude.com/docs/en/build-with-claude/effort) value such as `xhigh`. There is no hidden level above the ones on that page. This example sets effort at the top level of each request, which nee… prompting-claude-fable-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-fable-5 …st on Claude Fable 5. Use `high` as the default for most tasks, with `xhigh` for the most capability-sensitive workloads and `medium` or `low` for routine work. Lower effort settings on Claude Fable 5… prompting-claude-opus-4-8 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-4-8 …ding off capability for faster speed and lower costs. Start with the `xhigh` effort level for coding and agentic use cases, and use a minimum of `high` effort for most intelligence-sensitive use cases… prompting-claude-opus-5 Claude Developer Platform · in the page build-with-claude/prompt-engineering/prompting-claude-opus-5 …token cost and response time wherever quality holds, and step up to `xhigh` for demanding coding and agentic work. If you carried effort defaults over from a prior model, re-run an effort sweep on yo…