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[Feature] add cohere reasoning and tool parsers #40422

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Merged
vllm-bot merged 7 commits into from
Apr 29, 2026
Merged

[Feature] add cohere reasoning and tool parsers #40422

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9bc572b
[Feature][Reasoning] add cohere command 3 reasoning parser
walterbm Apr 21, 2026
8c8c743
[Feature][Tools] add cohere command 3 tool parser
walterbm Apr 21, 2026
f4c87d6
ai feedback
walterbm Apr 21, 2026
f7d5d77
fix tool grammar
walterbm Apr 21, 2026
e16dcea
add reasoning_start_str & reasoning_end_str
walterbm Apr 22, 2026
2f9a7e0
make cohere_melody an optional dependency
walterbm Apr 22, 2026
005ddab
remove tests
walterbm Apr 28, 2026
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1 change: 1 addition & 0 deletions docs/features/reasoning_outputs.md
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Expand Up @@ -13,6 +13,7 @@ vLLM currently supports the following reasoning models:

| Model Series | Parser Name | Structured Output Support | Tool Calling |
| ------------ | ----------- | ---------------- | ----------- |
| [Cohere Command A Reasoning](https://huggingface.co/CohereLabs/command-a-reasoning-08-2025) | `cohere_command3` | `json`, `regex` | ✅ |
| [DeepSeek R1 series](https://huggingface.co/collections/deepseek-ai/deepseek-r1-678e1e131c0169c0bc89728d) | `deepseek_r1` | `json`, `regex` | ❌ |
| [DeepSeek-V3.1](https://huggingface.co/collections/deepseek-ai/deepseek-v31-68a491bed32bd77e7fca048f) | `deepseek_v3` | `json`, `regex` | ❌ |
| [ERNIE-4.5-VL series](https://huggingface.co/baidu/ERNIE-4.5-VL-28B-A3B-PT) | `ernie45` | `json`, `regex` | ❌ |
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10 changes: 10 additions & 0 deletions docs/features/tool_calling.md
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Expand Up @@ -369,6 +369,16 @@ Flags:
* For non-reasoning: `--tool-call-parser hunyuan_a13b`
* For reasoning: `--tool-call-parser hunyuan_a13b --reasoning-parser hunyuan_a13b`

### Cohere Command A Reasoning (`cohere_command3`)

Supported models:

* [`CohereLabs/command-a-reasoning-08-2025`](https://huggingface.co/CohereLabs/command-a-reasoning-08-2025)

Flags: `--tool-call-parser cohere_command3 --reasoning-parser cohere_command3`

Note: the Cohere tool parser requires the `cohere_melody` package, which is not installed by default. Before using this parser please install the [cohere_melody](https://pypi.org/project/cohere-melody/) package.

### LongCat-Flash-Chat Models (`longcat`)

Supported models:
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8 changes: 8 additions & 0 deletions vllm/reasoning/__init__.py
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Expand Up @@ -36,6 +36,14 @@
"poolside_v1_reasoning_parser",
"PoolsideV1ReasoningParser",
),
"cohere_command3": (
"cohere_command_reasoning_parser",
"CohereCommand3ReasoningParser",
),
"cohere_command4": (
"cohere_command_reasoning_parser",
"CohereCommand4ReasoningParser",
),
"ernie45": (
"ernie45_reasoning_parser",
"Ernie45ReasoningParser",
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