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fix(copilot): honor advertised model endpoints (#34958)

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Aiden Cline 2026-07-02 10:23:57 -05:00 • committed by GitHub
commit 373cd08b98
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7 changed files with 131 additions and 20 deletions
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34
packages/core/src/plugin/provider/github-copilot.ts
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@ -1,19 +1,11 @@
import { Effect } from "effect"
import { ModelV2 } from "../../model"
import { define } from "../internal"
import { ProviderV2 } from "../../provider"
import type { PluginContext } from "@opencode-ai/plugin/v2/effect"
function shouldUseResponses(modelID: string) {
// Copilot supports Responses for GPT-5 class models, except mini variants
// which still need the chat-completions endpoint.
const match = /^gpt-(\d+)/.exec(modelID)
if (!match) return false
return Number(match[1]) >= 5 && !modelID.startsWith("gpt-5-mini")
}
export const GithubCopilotPlugin = define({
export const GithubCopilotPlugin = {
id: "github-copilot",
effect: Effect.fn(function* (ctx) {
effect: Effect.fn(function* (ctx: PluginContext) {
yield* ctx.catalog.transform(
Effect.fn(function* (evt) {
const item = evt.provider.get(ProviderV2.ID.githubCopilot)
@ -39,10 +31,22 @@ export const GithubCopilotPlugin = define({
evt.language = evt.sdk.languageModel(evt.model.api.id)
return
}
evt.language = shouldUseResponses(evt.model.api.id)
? evt.sdk.responses(evt.model.api.id)
: evt.sdk.chat(evt.model.api.id)
if (evt.options.endpoint === "responses" && evt.sdk.responses) {
evt.language = evt.sdk.responses(evt.model.api.id)
return
}
if (evt.options.endpoint === "chat" && evt.sdk.chat) {
evt.language = evt.sdk.chat(evt.model.api.id)
return
}
const match = /^gpt-(\d+)/.exec(evt.model.api.id)
// Copilot supports Responses for GPT-5 class models, except mini variants
// which still need the chat-completions endpoint.
evt.language =
match && Number(match[1]) >= 5 && !evt.model.api.id.startsWith("gpt-5-mini") && evt.sdk.responses
? evt.sdk.responses(evt.model.api.id)
: evt.sdk.chat(evt.model.api.id)
}),
)
}),
})
}