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## Summary Migrates the OpenAI provider in the LLM block from `chat.completions.create` to `responses.create` — OpenAI's newer, unified API. Also removes the obsolete GPT-3.5-turbo model. Resolves #11624 Linear: [OPEN-2911](https://linear.app/autogpt/issue/OPEN-2911/update-openai-calls-to-use-responsescreate) ## Changes - **`backend/blocks/llm.py`** — OpenAI provider now uses `responses.create` exclusively. Removed GPT-3.5-turbo enum + metadata. - **`backend/util/openai_responses.py`** *(new)* — Helpers for the Responses API: tool format conversion, content/reasoning/usage/tool-call extraction. - **`backend/util/openai_responses_test.py`** *(new)* — Unit tests for all helper functions. - **`backend/data/block_cost_config.py`** — Removed GPT-3.5 cost entry. - **`docs/integrations/block-integrations/llm.md`** — Regenerated block docs. ## Key API differences handled | Aspect | Chat Completions | Responses API | |--------|-----------------|---------------| | Messages param | `messages` | `input` | | Max tokens param | `max_completion_tokens` | `max_output_tokens` | | Usage fields | `prompt_tokens` / `completion_tokens` | `input_tokens` / `output_tokens` | | Tool format | Nested under `function` key | Flat structure | ## Test plan - [x] Unit tests for all `openai_responses.py` helpers - [x] Existing LLM block tests updated for Responses API mocks - [x] Regular OpenAI models work - [x] Reasoning OpenAI models work - [x] Non-OpenAI models work --------- Co-authored-by: Krzysztof Czerwinski <kpczerwinski@gmail.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>