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Sweep 19 Sep 2026 · 02:36Z Build v2.1.278 500 read Stable v2.1.267 Latest v2.1.278 Next v2.1.278 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.268 ·

Model family allowlist extended with placeholder future models

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Model list now recognizes placeholder future Claude models like claude-opus-4-6 and claude-sonnet-4-6

TierUnder the hoodhow much it should matter to you
Useful3my rating, 1 to 5
Signal4worth watching, 1 to 5
AreaModel Catalogwhat it touches
KindInternal Changesin v2.1.268,
Under the hood

Model list now recognizes placeholder future Claude models like claude-opus-4-6 and claude-sonnet-4-6

What

The internal list of known first-party Claude model families was extended to include claude-opus-4-6, claude-opus-4-7, and claude-sonnet-4-6, alongside the existing 4.x and 4.5 entries. A helper was also added to check whether a model string contains "application-inference-profile".

Why

This is preparatory groundwork so Claude Code recognizes these model names if and when they become available, rather than treating them as unknown; it does not mean these models are usable now.

Read from
Names in the bundleclaude-opus-4-6claude-opus-4-7claude-sonnet-4-6
What the documentation says
Documented inapi/about-claude/model-deprecations
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up claude-sonnet-4-6, on Messages. - `"claude-sonnet-4-6"` api/beta/messages see the edit
Confirmed since Anthropic's documentation has since written up claude-opus-4-6, on Messages. - `"claude-opus-4-6"` api/beta/messages see the edit
Confirmed since Anthropic's documentation has since written up claude-opus-4-7, on Messages. - `"claude-opus-4-7"` api/beta/messages see the edit
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding does not say whether these models are actually available or when they might be.
Anthropic's documentation agreesAnthropic's documentation has since written up claude-opus-4-7, on Messages.

See this entry in the whole of v2.1.268 →