[Frontend] Cohere chat v2 api support by andrewbcohere · Pull Request #47189 · vllm-project/vllm

andrewbcohere · 2026-06-30T17:21:22Z

Purpose

Implement the Cohere chat v2 api, see the RFC here: #43015

Test Plan

Unit & integration tests for new components
E2E tests are also being run, will add these and more tests once the general approach has been reviewed

Test Result

Tests run via pytest pass

pytest tests/renderers/test_cohere.py tests/entrypoints/cohere/ --ignore=tests/entrypoints/cohere/test_chat_v2.py 
================================================================================ test session starts ================================================================================
platform darwin -- Python 3.14.2, pytest-9.1.1, pluggy-1.6.0
configfile: pyproject.toml
plugins: asyncio-1.4.0, anyio-4.13.0
asyncio: mode=Mode.STRICT, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
collected 231 items                                                                                                                                                                 

tests/renderers/test_cohere.py .........................................................................................                                                      [ 38%]
tests/entrypoints/cohere/test_api_router.py .........                                                                                                                         [ 42%]
tests/entrypoints/cohere/test_protocol.py ............................                                                                                                        [ 54%]
tests/entrypoints/cohere/test_registry_and_args.py .......                                                                                                                    [ 57%]
tests/entrypoints/cohere/test_serving_conversion.py ...............................................................                                                           [ 84%]
tests/entrypoints/cohere/test_serving_streaming.py ...................................                                                                                        [100%]

========================================================================= 231 passed, 3 warnings in 43.17s ==========================================================================


python -m pytest tests/entrypoints/cohere/test_chat_v2.py
==================================================================== test session starts =====================================================================
platform linux -- Python 3.12.13, pytest-9.1.1, pluggy-1.6.0
configfile: pyproject.toml
plugins: asyncio-1.4.0, anyio-4.14.1
asyncio: mode=Mode.STRICT, debug=False, asyncio_default_fixture_loop_scope=None, asyncio_default_test_loop_scope=function
collected 6 items                                                                                                                                            

tests/entrypoints/cohere/test_chat_v2.py ......                                                                                                        [100%]

============================================================== 6 passed, 17 warnings in 43.57s ===============================================================

Essential Elements of an Effective PR Description Checklist

The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
The test plan, such as providing test command.
The test results, such as pasting the results comparison before and after, or e2e results
(Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

github-actions · 2026-06-30T17:27:56Z

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mergify · 2026-06-30T17:27:59Z

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @andrewbcohere.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

…v2-api-rfc Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

Docs updates Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

…-api-rfc

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

mergify · 2026-07-29T08:59:54Z

This pull request has merge conflicts that must be resolved before it can be
merged. Please rebase the PR, @andrewbcohere.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

…-api-rfc

aarnphm

I have one discussion point, but it shouldn't be blocking with merging this. Thanks for the hard work for getting this in!

aarnphm · 2026-07-29T20:47:32Z

+        """
+        return ChatMessage(*args, **kwargs)
+
+    def _finalize_response_message(


hmm, I wonder if parser we should also have a adjust_response to avoid having to do things like this up on the serving class.

cc @sfeng33 for opinions.

yes a adjust_response parser hook would keep parser-produced metadata like citations out of the serving class, it is non-blocking for this PR though.

Will take a look at implementing this in a follow up if you don't mind since it's not blocking, thanks!

chaunceyjiang · 2026-07-30T09:59:38Z


    register_anthropic_api_router(app)

+    from vllm.entrypoints.cohere.api_router import (


I’d like to introduce an environment variable that is disabled by default. The URL would only be registered when this option is explicitly enabled.

Previously, @WoosukKwon suggested avoiding adding new endpoints, so this approach would keep the default behavior unchanged.

I've added an env variable so the api is explicitly opt in. Let me know if it looks okay to you

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

mergify · 2026-07-30T19:35:42Z

Hi @andrewbcohere, the pre-commit checks have failed. Please run:

uv pip install pre-commit>=4.5.1
pre-commit install
pre-commit run --all-files

Then, commit the changes and push to your branch.

For future commits, pre-commit will run automatically on changed files before each commit.

…-api-rfc

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

…nflicts Dropped the legacy TYPE_CHECKING block and environment_variables dict wholesale, then ported main's delta across 10 main-side commits: Additions: VLLM_ROCM_USE_AITER_MOE_SITUV2_A8W4 (vllm-project#50582), VLLM_USE_RUST_BENCH (vllm-project#50081), VLLM_KIMI_K3_SHARD_SP_SHARED_EXPERT (vllm-project#50656), VLLM_RAISE_ON_LOGIT_NANS (vllm-project#50323), VLLM_ENABLE_COHERE_API (vllm-project#47189). Modifications: VLLM_COMPUTE_NANS_IN_LOGITS is now implied by VLLM_RAISE_ON_LOGIT_NANS (cross-field, so a model_validator); _resolve_rust_frontend_path -> _resolve_rust_cli_path, resolving on either VLLM_USE_RUST_FRONTEND or VLLM_USE_RUST_BENCH. Deletions: VLLM_CPU_SGL_KERNEL (vllm-project#50801), Q_/K_/V_SCALE_CONSTANT (vllm-project#49389 -- main deleted the dict entries but left the TYPE_CHECKING annotations; followed the PR's intent). tests: ported VLLMValidationError assertions; adapted test_rust_bench_auto_path_missing_fails_fast to construct ServerSettings directly. Dropped the Q_SCALE_CONSTANT case from test_envs_pydantic.py. AI assistance (Claude) was used for this merge resolution. Co-authored-by: Claude Signed-off-by: Vinay Damodaran <vrdn@hey.com>

mergify Bot added frontend tool-calling labels Jun 30, 2026

github-project-automation Bot added this to Tool Calling Jun 30, 2026

andrewbcohere changed the title ~~Cohere chat v2 api support~~ [Frontend] Cohere chat v2 api support Jun 30, 2026

mergify Bot added the needs-rebase label Jun 30, 2026

andrewbcohere added 4 commits June 30, 2026 13:28

Initial cohere chatv2 support

43d0542

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

tests fix

141648e

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

Use lighter model in integration test

b91221f

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

Style and lint fixes

b022606

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

andrewbcohere force-pushed the andrewbcohere/chat-v2-api-rfc branch from 609a8da to b022606 Compare June 30, 2026 17:28

Merge remote-tracking branch 'upstream/main' into andrewbcohere/chat-…

b007c99

…v2-api-rfc Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

andrewbcohere marked this pull request as ready for review June 30, 2026 17:40

andrewbcohere requested review from AndreasKaratzas, DarkLight1337, NickLucche, WoosukKwon, aarnphm, bbrowning, chaunceyjiang, houseroad, mgoin, njhill, robertgshaw2-redhat, russellb, sfeng33, tlrmchlsmth, yewentao256 and youkaichao as code owners June 30, 2026 17:40

github-project-automation Bot added this to NVIDIA Jul 28, 2026

mergify Bot added the cpu Related to CPU backends label Jul 28, 2026

github-project-automation Bot moved this to Ready in NVIDIA Jul 28, 2026

andrewbcohere added 3 commits July 28, 2026 16:12

Fixes to citation handling

40b1e9f

Docs updates Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

Merge remote-tracking branch 'origin/main' into andrewbcohere/chat-v2…

9ceb76c

…-api-rfc

add error handling middleware to make sure all errors are cohere format

8a02c99

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

mergify Bot added the needs-rebase label Jul 29, 2026

Merge remote-tracking branch 'origin/main' into andrewbcohere/chat-v2…

6083d03

…-api-rfc

mergify Bot removed the needs-rebase label Jul 29, 2026

aarnphm reviewed Jul 29, 2026

View reviewed changes

aarnphm approved these changes Jul 29, 2026

View reviewed changes

chaunceyjiang reviewed Jul 30, 2026

View reviewed changes

andrewbcohere added 2 commits July 30, 2026 13:55

minor cleanup

860afa5

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

added env var to make cohere api explicit opt in only

b59d160

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

andrewbcohere and others added 3 commits July 30, 2026 15:36

Merge remote-tracking branch 'origin/main' into andrewbcohere/chat-v2…

990561b

…-api-rfc

fmt fix

ac58d6a

Signed-off-by: Andrew Berneshawi <andrewberneshawi@cohere.com>

Merge branch 'main' into andrewbcohere/chat-v2-api-rfc

30c6c76

vllm-bot merged commit 9c110fa into vllm-project:main Aug 1, 2026
244 of 249 checks passed

github-project-automation Bot moved this from Ready to Done in NVIDIA Aug 1, 2026

github-project-automation Bot moved this to Done in Tool Calling Aug 1, 2026

swjeong9 mentioned this pull request Aug 13, 2026

Update vLLM to v0.27.1 ddps-lab/vllm-disaggregation#6

Merged

DarkLight1337 mentioned this pull request Aug 21, 2026

[RFC]: Add support for Cohere's /v2/chat HTTP API entry point #43015

Closed

1 task

mergify Bot added the cohere Related to Cohere models label Aug 21, 2026

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[Frontend] Cohere chat v2 api support - #47189

[Frontend] Cohere chat v2 api support#47189
vllm-bot merged 31 commits into
vllm-project:mainfrom
andrewbcohere:andrewbcohere/chat-v2-api-rfc

andrewbcohere commented Jun 30, 2026 •

edited by DarkLight1337

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		register_anthropic_api_router(app)

		from vllm.entrypoints.cohere.api_router import (

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andrewbcohere commented Jun 30, 2026 •

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