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fix: Align GPT context windows with Codex #9150

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aaiyer wants to merge 4 commits into from
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fix: Align GPT context windows with Codex #9150

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383a330
Align GPT context windows with Codex
aaiyer Jan 17, 2026
218d1ba
feat(openai): use Responses conversation state and remote compact
aaiyer Jan 18, 2026
1a85c8e
Merge branch 'anomalyco:dev' into dev
aaiyer Jan 18, 2026
70eb513
Revert "feat(openai): use Responses conversation state and remote com…
aaiyer Jan 18, 2026
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20 changes: 19 additions & 1 deletion packages/opencode/src/provider/provider.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,23 @@ import { ProviderTransform } from "./transform"
export namespace Provider {
const log = Log.create({ service: "provider" })

const CODEX_GPT_5_CONTEXT_WINDOW = 272_000
const CODEX_GPT_4_1_CONTEXT_WINDOW = 1_047_576
const CODEX_GPT_4O_CONTEXT_WINDOW = 128_000
const CODEX_GPT_3_5_CONTEXT_WINDOW = 16_385
const CODEX_GPT_OSS_CONTEXT_WINDOW = 96_000

function codexContextWindowForModelID(modelID: string): number | undefined {
const parts = modelID.split("/")
const slug = parts[parts.length - 1] ?? modelID
if (slug.startsWith("gpt-4.1")) return CODEX_GPT_4_1_CONTEXT_WINDOW
if (slug.startsWith("gpt-oss")) return CODEX_GPT_OSS_CONTEXT_WINDOW
if (slug.startsWith("gpt-4o")) return CODEX_GPT_4O_CONTEXT_WINDOW
if (slug.startsWith("gpt-3.5")) return CODEX_GPT_3_5_CONTEXT_WINDOW
if (slug.startsWith("gpt-5")) return CODEX_GPT_5_CONTEXT_WINDOW
return undefined
}

const BUNDLED_PROVIDERS: Record<string, (options: any) => SDK> = {
"@ai-sdk/amazon-bedrock": createAmazonBedrock,
"@ai-sdk/anthropic": createAnthropic,
Expand Down Expand Up @@ -587,6 +604,7 @@ export namespace Provider {
export type Info = z.infer<typeof Info>

function fromModelsDevModel(provider: ModelsDev.Provider, model: ModelsDev.Model): Model {
const codexContextWindow = codexContextWindowForModelID(model.id)
const m: Model = {
id: model.id,
providerID: provider.id,
Expand Down Expand Up @@ -619,7 +637,7 @@ export namespace Provider {
: undefined,
},
limit: {
context: model.limit.context,
context: codexContextWindow ?? model.limit.context,
input: model.limit.input,
output: model.limit.output,
},
Expand Down