fix(providers/openai): route gpt-5.6 family through Responses API#46
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gpt-5.6-sol, gpt-5.6-terra, and gpt-5.6-luna are reasoning models and must use the Responses API. Without allowlist entries they fell through to the Chat Completions path, which breaks reasoning continuity for agents.
ibetitsmike
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gpt-5.6 models were unusable with agents: fantasy's Responses allowlist did not include the new family, so `IsResponsesModel` returned false and chatd fell back to the Chat Completions path (no reasoning params, no encrypted reasoning continuity). ## Changes - Bump the `charm.land/fantasy` replace pin to coder/fantasy `6da0c3b10237` (coder_2_33), pulling in: - coder/fantasy#46: route `gpt-5.6-sol`, `gpt-5.6-terra`, `gpt-5.6-luna` through the OpenAI Responses API as reasoning models. - coder/fantasy#41: surface Anthropic refusal stop_reason as content-filter (already on coder_2_33, rides along with the bump). - Update the fork changelog comment in go.mod. ## Verification - Probed all three gpt-5.6 models through the ai-gateway: `/v1/responses` with `reasoning.effort`, `include: ["reasoning.encrypted_content"]`, and `store: false` completes for each. - `go build ./coderd/...` and `go test ./coderd/x/chatd/chatopenai/ ./coderd/x/chatd/chatprovider/` pass against the new pin. > This PR was authored by Mux on Mike's behalf.
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gpt-5.6-sol, gpt-5.6-terra, and gpt-5.6-luna were missing from
responsesReasoningModelIDs, soIsResponsesModelreturned false and the provider fell through to the Chat Completions path. chatd gates the Responses API on this allowlist (WithUseResponsesAPI+IsResponsesModel), which broke the gpt-5.6 family for agents: no reasoning params, no encrypted reasoning continuity.Changes
gpt-5.6-sol,gpt-5.6-terra,gpt-5.6-lunatoresponsesReasoningModelIDs.Verification
Probed all three models through the ai-gateway:
/v1/responseswithreasoning.effort,include: ["reasoning.encrypted_content"], andstore: falsecompletes for each, confirming they are Responses reasoning models like the rest of the gpt-5.x line.Only the shipped preview IDs are added, matching the earlier gpt-5.5 trim (48e61a0). Upstream's speculative
gpt-5.6/-pro/-mini/-nano/-codexentries (upstream 29b1da1) will arrive with the next upstream sync. Note #45 adds onlygpt-5.6-soland targetsmain; coder/coder pinscoder_2_33, hence this PR.