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release(core): 1.5.0 (#38978)
master
9 hours ago
release(core): 1.5.0
release/core-1.5.0
10 hours ago
feat(core): add `reasoning_effort` as a standard chat model parameter (#38887) `langchain-anthropic`, `langchain-openai`, `langchain-fireworks`, and `langchain-xai` now support a standard `reasoning_effort` parameter. It can be set at model construction or per invocation, with each provider translating it to the appropriate API. `ModelProfile` now exposes supported reasoning effort levels and the default level for supported models. --- Adds a standard `reasoning_effort` parameter across chat model integrations. Like `temperature`, it can be set on the model or per call, while each provider translates it into its own API format. Motivating example: [`deepagents-code` (dcode)](https://docs.langchain.com/oss/python/deepagents/code/overview) implemented provider-agnostic reasoning effort itself. This PR upstreams that support into LangChain's provider integrations, making `reasoning_effort` a standard parameter and exposing supported levels via `ModelProfile`. ```python from langchain_anthropic import ChatAnthropic model = ChatAnthropic(model="claude-sonnet-4-6") model.invoke( "Why do parrots have colorful feathers?", reasoning_effort="high", ) ``` ### Model specific labels and default | Provider | Model / version | Levels supported | Default | |----------|-----------------|------------------|---------| | **OpenAI** | gpt-5.5, gpt-5.6* | `none`, `low`, `medium`, `high`, `xhigh` (+ `max` on gpt-5.6+) | `medium` | | | other gpt-5* | `none`, `low`, `medium`, `high`, `xhigh` | — | | **Anthropic** | Opus 4.0 / 4.1 | *(none – predates effort entirely)* | — | | | Opus 4.5 | `low`, `medium`, `high` | `high` | | | Opus 4.6 | `low`, `medium`, `high`, `max` | `high` | | | Opus 4.7+ | `low`, `medium`, `high`, `xhigh`, `max` | `high` | | | Sonnet 4.0 / 4.1 / 4.5 | *(none – predates or rejects effort)* | — | | | Sonnet 4.6 | `low`, `medium`, `high`, `max` | `high` | | | Sonnet 5+ | `low`, `medium`, `high`, `xhigh`, `max` | `high` | | **Fireworks** | DeepSeek V4 Pro | `none`, `low`, `medium`, `high`, `xhigh`, `max` | `high` | | | Kimi K2 | `low`, `medium`, `high` | — | | | GLM 5 | `none`, `high`, `max` | `max` | | **xAI** | Grok 4.5-class models | `low`, `medium`, `high` | `high` | ### Provider specific details | Provider | Model class | Translation | |----------|-------------|-------------| | **OpenAI** | `ChatOpenAI` | Translates `reasoning_effort` to `reasoning.effort` and adds `summary: "auto"`. | | **Anthropic** | `ChatAnthropic` | Translates `reasoning_effort` to `output_config.effort` and defaults `thinking` to `adaptive`. | | **Fireworks** | `ChatFireworks` | Sends `reasoning_effort` as a flat field unchanged. | | **xAI** | `ChatXAI` | Nests `reasoning_effort` under `extra_body.reasoning_effort`. | ### Anthropic: `effort` alias `ChatAnthropic` already exposed an `effort` parameter. This PR makes it a true Pydantic alias for `reasoning_effort` while preserving existing behavior. - Both `effort` and `reasoning_effort` work at construction; if both are provided, `effort` wins. - Call-time (`.invoke()`, `.bind()`) support is handled manually to preserve the same precedence, since Pydantic aliases only apply at construction. - `effort` remains supported (no deprecation). ### Other providers - **DeepSeek**: inherits support from `BaseChatOpenAI`. - **Groq** and **Perplexity**: already have native `reasoning_effort` support. - **OpenRouter** and **Mistral AI**: out of scope (no native support today). - **Google (Gemini)**: implemented separately in [`langchain-google`](https://github.com/langchain-ai/langchain-google/pull/1895)
master
10 hours ago
Merge branch 'master' into nm/reasoning-effort
nm/reasoning-effort
10 hours ago
fix
nm/reasoning-effort
10 hours ago
Merge branch 'master' into nm/reasoning-effort
nm/reasoning-effort
11 hours ago
format
cc/profiling-test-1
14 hours ago

Latest Branches

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release(core): 1.5.0#38978
10 hours ago
f231bd5
release/core-1.5.0
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feat(langchain): expose toggle to trace inputs on `AgentMiddleware`#38910
14 hours ago
b8c1620
cc/profiling-test-1
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