claude-sonnet-4-0
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.
Switching to any Sonnet model name ending in [1m] now checks for 1M-context access, except four older Sonnet models
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.283.
In the changelogs
3Releases whose published page names claude-sonnet-4-0.
-
v2.1.284
Gateway model list marks 1M-context models, and telemetry export can use Google sign-in
The gateway now flags which models support the 1M context window, and telemetry export gains an
auth.googleoption for Google access tokensfound in this entry's text
-
v2.1.283
The Sonnet 1M-context check now covers full Sonnet model names
Switching to any Sonnet model name ending in [1m] now checks for 1M-context access, except four older Sonnet models
found in this entry's text
-
v2.1.201
claude-sonnet-5 added to model compatibility list
found in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
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.