This PR uses https://github.com/zed-industries/zed/pull/57758 as a base
and adds tests, cleans up the comments, and checks changes the database
query used in auth.db to include oauth key.
Self-Review Checklist:
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable
Closes #ISSUE
Release Notes:
- Fixed GitHub Copilot Chat showing an empty model dropdown for users on
newer Copilot SDK builds
---------
Co-authored-by: Alexander Shlemov <eodus@users.noreply.github.com>
Co-authored-by: cameron <cameron.studdstreet@gmail.com>
## Summary
Fixes#47540 - Anthropic Claude models not appearing in GitHub Copilot
Chat model picker.
## Problem
Users reported that Anthropic Claude models (Claude Sonnet 4, Claude
Opus 4, etc.) were not appearing in the model picker when using GitHub
Copilot Chat, even though:
- The GitHub Copilot API returns these models
- The models have `model_picker_enabled: true`
- Users have valid Copilot subscriptions with access to these models
## Root Cause
The issue was in the `ModelSupportedEndpoint` enum deserialization. The
enum only defined two variants:
```rust
pub enum ModelSupportedEndpoint {
#[serde(rename = "/chat/completions")]
ChatCompletions,
#[serde(rename = "/responses")]
Responses,
}
```
Anthropic Claude models use the `/v1/messages` endpoint, which wasn't
defined. When deserializing the API response, serde failed with:
```
Error("unknown variant `/v1/messages`, expected `/chat/completions` or `/responses`")
```
Because the crate uses resilient deserialization via
`deserialize_models_skip_errors()`, the entire Claude model was silently
skipped rather than causing a hard failure. This meant users saw no
error - the models simply didn't appear.
## Solution
### 1. Added `/v1/messages` endpoint variant
```rust
pub enum ModelSupportedEndpoint {
#[serde(rename = "/chat/completions")]
ChatCompletions,
#[serde(rename = "/responses")]
Responses,
#[serde(rename = "/v1/messages")]
Messages, // NEW: Anthropic models use this endpoint
#[serde(other)]
Unknown, // NEW: Future-proofing for unknown endpoints
}
```
### 2. Removed incorrect `dedup_by()` call
The previous code deduplicated models by family:
```rust
.dedup_by(|a, b| a.capabilities.family == b.capabilities.family)
```
This incorrectly filtered out model variants that share the same family
(e.g., `claude-sonnet-4` and `claude-sonnet-4-thinking`). Removed this
call to preserve all model variants.
### 3. Removed unused import
Removed `use itertools::Itertools;` which was only used for the
now-removed `dedup_by()`.
## Changes
| File | Change |
|------|--------|
| `crates/copilot_chat/src/copilot_chat.rs` | Added `Messages` and
`Unknown` variants to `ModelSupportedEndpoint` enum |
| `crates/copilot_chat/src/copilot_chat.rs` | Removed `.dedup_by()` call
that incorrectly filtered models |
| `crates/copilot_chat/src/copilot_chat.rs` | Removed unused
`itertools::Itertools` import |
| `crates/copilot_chat/src/copilot_chat.rs` | Added 8 new unit tests |
## Test Coverage
Added 8 new unit tests to ensure the fix works and prevent regression:
| Test | Purpose |
|------|---------|
| `test_models_with_pending_policy_deserialize` | Verifies models with
non-"enabled" policy states deserialize correctly (they're filtered
later) |
| `test_multiple_anthropic_models_preserved` | Verifies multiple Claude
models are not incorrectly deduplicated |
| `test_models_with_same_family_both_preserved` | Verifies models
sharing the same family (e.g., thinking variants) are both preserved |
| `test_mixed_vendor_models_all_preserved` | Verifies models from
different vendors (OpenAI, Anthropic, Google) are all preserved |
| `test_model_with_messages_endpoint_deserializes` | **Critical test**:
Verifies `/v1/messages` endpoint deserializes correctly |
| `test_model_with_unknown_endpoint_deserializes` | Verifies unknown
future endpoints deserialize to `Unknown` variant |
| `test_model_with_multiple_endpoints` | Verifies models with multiple
endpoints deserialize correctly |
| `test_supports_response_method` | Verifies the `supports_response()`
method logic for endpoint routing |
### Test Results
```
running 10 tests
test tests::test_model_with_messages_endpoint_deserializes ... ok
test tests::test_model_with_multiple_endpoints ... ok
test tests::test_model_with_unknown_endpoint_deserializes ... ok
test tests::test_models_with_pending_policy_deserialize ... ok
test tests::test_models_with_same_family_both_preserved ... ok
test tests::test_mixed_vendor_models_all_preserved ... ok
test tests::test_multiple_anthropic_models_preserved ... ok
test tests::test_resilient_model_schema_deserialize ... ok
test tests::test_supports_response_method ... ok
test tests::test_unknown_vendor_resilience ... ok
test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
```
## How to Test Manually
1. Sign in to GitHub Copilot in Zed
2. Open the model picker (Agent panel → model selector dropdown)
3. Verify that Anthropic Claude models appear in the list:
- Claude Sonnet 4
- Claude Opus 4
- Other Claude variants (if enabled in your GitHub Copilot settings)
## Checklist
- [x] Code compiles without errors
- [x] `./script/clippy --package copilot_chat` passes with no warnings
- [x] All unit tests pass
- [x] Change is focused on a single bug fix
- [x] No unrelated refactoring or feature additions
<img width="320" height="400" alt="Screenshot 2026-01-24 at 11 57 21 PM"
src="https://github.com/user-attachments/assets/d5e17e1b-da80-4f4d-a218-d50d35114a21"
/>
Release Notes:
- Fixed Anthropic models not appearing in the Copilot Chat model picker
---------
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>
- **copilot: Fix double lease panic when signing out**
- **Extract copilot_chat into a separate crate**
- **Do not use re-exports from copilot**
- **Use new SignIn API**
- **Extract copilot_ui out of copilot**
Closes#7501
Release Notes:
- Fixed Copilot providing suggestions from different Zed windows.
- Copilot edit predictions now support jumping to unresolved
diagnostics.
