Gateway config checks warn about model lists that would reject…

Gateway config checks warn about model lists that would reject every request

Gateway checks now warn when availableModels is empty or leaves out the default model, both of which get requests refused

You'll noticeTier: how much it should matter to you

2Useful: my rating, 1 to 5

1Signal: worth watching, 1 to 5

GatewayArea: what it touches

ImprovementsKind: in v2.1.284, 28 Sep 26

ImprovementsSection of the release

What

The checks Claude Code runs on a gateway configuration add two warnings about availableModels, the list of models people are allowed to pick:

An empty availableModels list in managed settings (settings an organization installs centrally). Claude Code reads an empty list as "Default model only", but the gateway checks requests against the list itself, so every request is rejected.
A list that leaves out the model Claude Code starts on by default. Developers then get a 400 error (a rejected request) on every request until they choose a listed model with /model. No warning is given when model, enforceAvailableModels, availableModelsMatch: "exact", ANTHROPIC_MODEL, ANTHROPIC_DEFAULT_MODEL or ANTHROPIC_DEFAULT_OPUS_MODEL is set. The warning suggests setting enforceAvailableModels: true or model.

Before, the only warning was about aliases in availableModels.

Why

Admins find a setting that would break every developer's requests before rolling it out, rather than after.

Read from

Names in the bundleavailableModels

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 doubtWhich command or screen shows these warnings is not confirmed.

Anthropic's release notes agreeAdded Claude apps gateway startup warnings when a managed policy's availableModels is empty, or leaves out the model Claude Code starts on…

See this entry in the whole of v2.1.284 →

The build it came inv2.1.284

28 Sep 2026 · 328 entries, this one is #121.

Use it now18
You'll notice199
Nothing to try yet25
Under the hood86

Either side of it

v2.1.283Older

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Names in this entry

settingavailableModels
Restrict which models people can pick
slash/model
Switch the AI model and save it as your default for new sessions. For models that support it, use left/right arrows to adjust effort level. With no argument, opens a picker; press s on a row to switch for the current session only. See when Claude Code asks you to confirm the switch. Once you confirm the switch, if Claude Code asks, Claude Code applies the change without waiting for the current response to finish. Before v2.1.242, Claude Code decided from a feature flag it fetched from Anthropic whether to run the command mid-turn or queue it until the turn finished, and always queued it in a session that doesn't fetch feature flags, such as on a third-party provider. Also available in non-interactive mode (-p) with a model argument instead of the picker, where it applies to the current session only and isn't saved as your default; requires Claude Code v2.1.205 or later
settingmodel
Change the model Claude Code starts with
settingenforceAvailableModels
Keep the /model Default choice inside your availableModels allowlist
settingavailableModelsMatch
Make each availableModels model ID entry permit only the version it names
envANTHROPIC_MODEL
Name of the model setting to use (see Model Configuration)
envANTHROPIC_DEFAULT_MODEL
Model that new sessions start on by default. Requires Claude Code v2.1.236 or later. See Set a default model for new sessions
envANTHROPIC_DEFAULT_OPUS_MODEL
Model ID that the opus alias resolves to, and that opusplan uses while Plan Mode is active. See Model configuration

Anthropic's notes

Upstream's own release notes for v2.1.284 name something this entry names, so the two are probably about the same change. Probably: the pairing is made on a shared name rather than on the words around it.

Added Claude apps gateway startup warnings when a managed policy's availableModels is empty, or leaves out the model Claude Code starts on without setting model or enforceAvailableModels
Fixed the /model picker showing "+1 model" below the list after scrolling to the last model; the count now covers only the models below the visible rows
Changed safety-related model switches in sessions that pin an Opus model with ANTHROPIC_DEFAULT_OPUS_MODEL or modelOverrides: on the Anthropic API, the API now picks the model to switch to for each kind of flag, not the pinned model
[VSCode] Fixed typing /model and Enter printing usage text into the chat instead of opening the model selector

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