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HomeDocsClaude Code CLI 1 Oct 2026
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Model configuration changedmodel-config

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Upstream edited this page at 1 Oct 2026 03:54 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 1 Oct 2026 04:07 UTC.

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3131| **`sonnet`** | Uses the latest Sonnet model for daily coding tasks |
3232| **`opus`** | Uses the latest Opus model for complex reasoning tasks |
3333| **`haiku`** | Uses the fast and efficient Haiku model for simple tasks |
34| **`sonnet[1m]`** | Uses Sonnet with a [1 million token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-window-sizes-by-model) for long sessions. No effect when `sonnet` already resolves to Sonnet 5.5 or Sonnet 5 with their native 1M window; behind an [LLM gateway](/docs/en/llm-gateway), selects the 1M window for that model |
34| **`sonnet[1m]`** | Uses Sonnet with a [1 million token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-window-sizes-by-model) for long sessions. No effect when `sonnet` already resolves to Sonnet 5.5 or Sonnet 5 with their native 1M window |
3535| **`opus[1m]`** | Uses Opus with a [1 million token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-window-sizes-by-model) for long sessions |
3636| **`opusplan`** | Special mode that uses `opus` during plan mode, then switches to `sonnet` for execution |
3737 
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703703 
704704Claude Code checks these plan requirements only when it connects to the Anthropic API directly. If you point `ANTHROPIC_BASE_URL` at an [LLM gateway](/docs/en/llm-gateway#subscriptions-and-gateways) and your saved claude.ai login stays the active credential, Claude Code doesn't check your plan's usage credits. The `[1m]` options stay available in `/model`, and the gateway decides whether the request succeeds. Before v2.1.229, Claude Code rejected `/model sonnet[1m]` in that configuration when it couldn't confirm usage credits on the account.
705705 
706<span id="context-window-behind-a-gateway" />
707 
708If you set `ANTHROPIC_BASE_URL` to an [LLM gateway](/docs/en/llm-gateway) or another proxy, Claude Code gives each model it recognizes the same context window the model has on the Anthropic API. Fable 5.1, Fable 5, Sonnet 5 and later, and Opus 4.7 and later get the 1M window with no `[1m]` variant to select, and a model that reaches 1M only through its `[1m]` variant, such as Opus 4.6, runs at 200K without it. Claude Code can't detect a lower limit that the gateway or the server behind it enforces. If your gateway rejects requests above 200K tokens, run [`/autocompact 200k`](#set-the-auto-compact-window) so sessions compact at that boundary.
709 
706710To turn off 1M context, set `CLAUDE_CODE_DISABLE_1M_CONTEXT=1`. Claude Code removes 1M model variants from the model picker. On models with a native 1M window, such as Sonnet 5 and the Fable models, it also treats the model as having a 200K context window:
707711 
708712* With auto-compaction on, sessions compact at the 200K boundary through [auto-compaction](#set-the-auto-compact-window). Setting the auto-compact window above 200K doesn't lift the hold, because Claude Code caps that window at the model's context window.
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729733 
730734On the Anthropic API, Sonnet 5.5 and Sonnet 5 always run with the 1M context window. There is no 200K variant, no `[1m]` suffix to select, and no usage credits required on any plan. Sessions auto-compact before the window fills, at about 967K tokens by default; set [`CLAUDE_CODE_AUTO_COMPACT_WINDOW`](/docs/en/env-vars) to choose a different threshold.
731735 
732Two configurations budget the window at 200K instead:
736Claude Code gives Sonnet 5.5 and Sonnet 5 the same 1M window behind an [LLM gateway](/docs/en/llm-gateway) or another custom `ANTHROPIC_BASE_URL`. If your gateway enforces a lower limit, see [the context window behind a gateway](#context-window-behind-a-gateway).
733737 
734* **LLM gateway**: when `ANTHROPIC_BASE_URL` points at a [gateway](/docs/en/llm-gateway), Claude Code can't verify 1M support. To use the full window, select Sonnet 5.5 (1M context) in the model picker, which maps to `sonnet[1m]`, or run `/model claude-sonnet-5[1m]` for Sonnet 5.
738This setting budgets the window at 200K instead:
739 
735740* **`CLAUDE_CODE_DISABLE_1M_CONTEXT=1`**: holds sessions on every model with a native 1M window to a 200K window; see [Extended context](#extended-context) for how the hold is enforced. Useful for deployments that need to cap context.
736741 
737742## Context window and auto-compaction
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761766* [Cloud sessions](/docs/en/claude-code-on-the-web) compact as the conversation approaches the model's limit
762767* Sonnet 4.6 and Opus 4.6 without [extended context](#extended-context) compact at the 200K boundary, and so do Opus 4.8 and later when they run with a 200K context window, such as on Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry
763768* When you set [`CLAUDE_CODE_DISABLE_1M_CONTEXT=1`](/docs/en/env-vars), models with a native 1M window, such as Sonnet 5 and the Fable models, compact at the 200K boundary
764* Models running with a native 1M window, such as Sonnet 5, the Fable models, and Opus 4.7 and later on the Anthropic API, compact before the window fills, at about 967K tokens by default. On Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry, [Pin models for third-party deployments](#pin-models-for-third-party-deployments) says which models run with that window; for the configurations that budget Sonnet 5.5 and Sonnet 5 at 200K instead, see [Sonnet 5.5 and Sonnet 5 context window](#sonnet-5-5-and-sonnet-5-context-window)
769* Models running with a native 1M window compact before the window fills, at about 967K tokens by default. On the Anthropic API, these include Sonnet 5, the Fable models, and Opus 4.7 and later. On Amazon Bedrock, Google Cloud's Agent Platform, and Microsoft Foundry, see [Pin models for third-party deployments](#pin-models-for-third-party-deployments) for which models run with that window. Behind a custom `ANTHROPIC_BASE_URL`, see [the context window behind a gateway](#context-window-behind-a-gateway)
765770* Sessions on a model ID Claude Code doesn't recognize, such as an [LLM gateway](/docs/en/llm-gateway) alias, compact at the context window Claude Code assumes for the ID; see [Correct the window for a gateway or custom model ID](#correct-the-window-for-a-gateway-or-custom-model-id)
766771 
767772### Correct the window for a gateway or custom model ID
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