{"name":"claude-sonnet-4-0","slug":"claude-sonnet-4-0","family":"model","title":"Models","noun":"model","description":"Switching to any Sonnet model name ending in [1m] now checks for 1M-context access, except four older Sonnet models","description_source":"entry","described_by":{"version":"2.1.283","anchor":"sonnet-1m-context-availability-check-now-covers-any-sonnet"},"presence":{"first_seen":null,"removed_in":null,"in_current_build":false,"newest_mined":"2.1.308","builds":0,"mined_builds":149,"first_cited":null},"aliases":[],"entries":[{"version":"2.1.284","anchor":"gateway-model-list-advertises-1m-context-support-and-adds-au","heading":"Gateway model list marks 1M-context models, and telemetry export can use Google sign-in","line":"The gateway now flags which models support the 1M context window, and telemetry export gains an `auth.google` option for Google access tokens","released_at":"2026-09-28 17:11:59","reason":"found in this entry's text"},{"version":"2.1.283","anchor":"sonnet-1m-context-availability-check-now-covers-any-sonnet","heading":"The Sonnet 1M-context check now covers full Sonnet model names","line":"Switching to any Sonnet model name ending in [1m] now checks for 1M-context access, except four older Sonnet models","released_at":"2026-09-25 18:46:11","reason":"found in this entry's text"},{"version":"2.1.201","anchor":"claude-sonnet-5-added-to-model-compatibility-list","heading":"claude-sonnet-5 added to model compatibility list","line":null,"released_at":"2026-07-03 20:52:33","reason":"found in this entry's text"}],"entries_total":3,"docs":[],"docs_total":0,"gates":[],"related":[{"name":"claude-sonnet-4-5","slug":"claude-sonnet-4-5","description":"Writing a file you have not read is now decided locally by model and permissions, not a server flag."},{"name":"claude-sonnet-4-5-20250929","slug":"claude-sonnet-4-5-20250929","description":"The dated first-party API id of Sonnet 4.5 (`claude-sonnet-4-5` in Claude Code's model table), also used for the `anthropic_aws`, `anthropic_google_cloud` and `gateway` providers. On the first-party provider, when certain account checks pass, a startup migration rewrites a user-settings `model` of `claude-sonnet-4-5-20250929` or `sonnet-4-5-20250929` (with or without `[1m]`) to `sonnet` or `sonnet[1m]`."},{"name":"claude-sonnet-4-6","slug":"claude-sonnet-4-6","description":"Context limits for claude-sonnet-5 are 500,000 on two surfaces and a million elsewhere."}],"url":"https:\/\/changelogs.core-directive.com\/reference\/model\/claude-sonnet-4-0","family_url":"https:\/\/changelogs.core-directive.com\/reference\/model.json"}