claude-opus-4-6
A Claude Code model, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Opus 5 is now the default Opus, with a 1M-context option in the model picker.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.
In the changelogs
10Releases whose published page names claude-opus-4-6.
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v2.1.280
Future model IDs (opus-4-6, opus-4-7, opus-4-8, sonnet-4-6) added to model-recency comparison list
Model-recency list gains claude-opus-4-6, claude-sonnet-4-6, claude-opus-4-7 and claude-opus-4-8
found in this entry's text
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v2.1.268
Model family allowlist extended with placeholder future models
Model list now recognizes placeholder future Claude models like claude-opus-4-6 and claude-sonnet-4-6
found in this entry's text, named in this entry
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v2.1.248
Per-surface context limits for claude-sonnet-5
Context limits for claude-sonnet-5 are 500,000 on two surfaces and a million elsewhere.
found in this entry's text
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v2.1.248
Unreleased Mythos and next-generation model ids in the bundled tables
Model tables carry ids for a Mythos preview and a 5-series family, not selectable.
found in this entry's text
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v2.1.219
Opus 5 replaces Opus 4.8 as the default Opus model
Opus 5 is now the default Opus, with a 1M-context option in the model picker.
found in this entry's text
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v2.1.195
Model Catalog: New and Updated Models
found in this entry's text
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v2.1.174
Advisor Model Capability Enforcement
found in this entry's text
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v2.1.174
Opus 4.6 Sunset Date Notification
found in this entry's text
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v2.1.73
Model ID Override Mapping (Enterprise)
found in this entry's text
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v2.1.32
Claude Opus 4.6 Support
found in this entry's text
First cited
4The earliest release whose published evidence quoted claude-opus-4-6 was v2.1.32, 5 Feb 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the model does. All models.