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Sweep 28 Aug 2026 ยท 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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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8 pages for anthropic_default_opus_model.

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Claude Code on Amazon Bedrock Claude Code CLI · in the page amazon-bedrock …environment variables to specific Amazon Bedrock model IDs. Without `ANTHROPIC_DEFAULT_OPUS_MODEL`, the `opus` alias on Amazon Bedrock resolves to Opus 5, and without `ANTHROPIC_DEFAULT_SONNET_MODEL`… Claude Code changelog Claude Code CLI · in the page changelog …model IDs getting a doubled 1M-context suffix (e.g. `[1M][1m]`) when `ANTHROPIC_DEFAULT_OPUS_MODEL` already includes one * Fixed `opusplan` model setting not shipping with 1M context in plan mode fo… Claude Code on Claude Platform on AWS Claude Code CLI · in the page claude-platform-on-aws …or Claude Platform on AWS, which can lag the newest release. Without `ANTHROPIC_DEFAULT_OPUS_MODEL`, the `opus` alias resolves to Opus 5. Before v2.1.219, it resolved to Opus 4.8, and before v2.1.207… Environment variables Claude Code CLI · in the page env-vars …| | `ANTHROPIC_DEFAULT_OPUS_MODEL` | Model ID that the `opus` alias resolves to, and that `opusplan` uses whil… Claude Code on Google Cloud's Agent Platform Claude Code CLI · in the page google-vertex-ai …iables to specific Google Cloud's Agent Platform model IDs. Without `ANTHROPIC_DEFAULT_OPUS_MODEL`, the `opus` alias on Google Cloud's Agent Platform resolves to Opus 5, and without `ANTHROPIC_DEFAUL… Claude Code on Microsoft Foundry Claude Code CLI · in the page microsoft-foundry …iables to match the deployment names you created in step 1. Without `ANTHROPIC_DEFAULT_OPUS_MODEL`, the `opus` alias on Microsoft Foundry resolves to Opus 4.6. Set it to the ID of a newer Opus model,… Model configuration Claude Code CLI · in the page model-config …are available by selecting the full model name explicitly or setting `ANTHROPIC_DEFAULT_OPUS_MODEL` or `ANTHROPIC_DEFAULT_SONNET_MODEL`. Before v2.1.219, `opus` resolved to Opus 4.8 on the Anthropic… Enterprise deployment overview Claude Code CLI · in the page third-party-integrations …, pin specific model versions using `ANTHROPIC_DEFAULT_FABLE_MODEL`, `ANTHROPIC_DEFAULT_OPUS_MODEL`, `ANTHROPIC_DEFAULT_SONNET_MODEL`, and `ANTHROPIC_DEFAULT_HAIKU_MODEL`. Without pinning, model alias…