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feat: add OpenAI-compatible provider shim — use any LLM with Claude Code

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Adds a new 'openai' API provider that translates Anthropic SDK calls to
OpenAI chat completions format, enabling Claude Code's full tool system
(bash, file read/write/edit, grep, glob, agents) with any OpenAI-compatible
model: GPT-4o, DeepSeek, Gemini, Llama, Ollama, OpenRouter, and 200+ more.

Set CLAUDE_CODE_USE_OPENAI=1, OPENAI_API_KEY, and OPENAI_MODEL to use.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
did:key:z6MkqDnb7Siv3Cwj7pGJq4T5EsUisECqR8KpnDLwcaZq5TPr
2026-03-31 23:12:43 +08:00
parent d2542c9a62
commit 619b5fb603
6 changed files with 786 additions and 12 deletions
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21
src/utils/model/model.ts
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@@ -34,7 +34,12 @@ export type ModelName = string
export type ModelSetting = ModelName | ModelAlias | null
export function getSmallFastModel(): ModelName {
return process.env.ANTHROPIC_SMALL_FAST_MODEL || getDefaultHaikuModel()
if (process.env.ANTHROPIC_SMALL_FAST_MODEL) return process.env.ANTHROPIC_SMALL_FAST_MODEL
// For OpenAI provider, use OPENAI_MODEL or a sensible default
if (getAPIProvider() === 'openai') {
return process.env.OPENAI_MODEL || 'gpt-4o-mini'
}
return getDefaultHaikuModel()
}
export function isNonCustomOpusModel(model: ModelName): boolean {
@@ -66,7 +71,7 @@ export function getUserSpecifiedModelSetting(): ModelSetting | undefined {
specifiedModel = modelOverride
} else {
const settings = getSettings_DEPRECATED() || {}
specifiedModel = process.env.ANTHROPIC_MODEL || settings.model || undefined
specifiedModel = process.env.ANTHROPIC_MODEL || process.env.OPENAI_MODEL || settings.model || undefined
}
// Ignore the user-specified model if it's not in the availableModels allowlist.
@@ -106,6 +111,10 @@ export function getDefaultOpusModel(): ModelName {
if (process.env.ANTHROPIC_DEFAULT_OPUS_MODEL) {
return process.env.ANTHROPIC_DEFAULT_OPUS_MODEL
}
// OpenAI provider: use user-specified model or default
if (getAPIProvider() === 'openai') {
return process.env.OPENAI_MODEL || 'gpt-4o'
}
// 3P providers (Bedrock, Vertex, Foundry) — kept as a separate branch
// even when values match, since 3P availability lags firstParty and
// these will diverge again at the next model launch.
@@ -120,6 +129,10 @@ export function getDefaultSonnetModel(): ModelName {
if (process.env.ANTHROPIC_DEFAULT_SONNET_MODEL) {
return process.env.ANTHROPIC_DEFAULT_SONNET_MODEL
}
// OpenAI provider
if (getAPIProvider() === 'openai') {
return process.env.OPENAI_MODEL || 'gpt-4o'
}
// Default to Sonnet 4.5 for 3P since they may not have 4.6 yet
if (getAPIProvider() !== 'firstParty') {
return getModelStrings().sonnet45
@@ -132,6 +145,10 @@ export function getDefaultHaikuModel(): ModelName {
if (process.env.ANTHROPIC_DEFAULT_HAIKU_MODEL) {
return process.env.ANTHROPIC_DEFAULT_HAIKU_MODEL
}
// OpenAI provider
if (getAPIProvider() === 'openai') {
return process.env.OPENAI_MODEL || 'gpt-4o-mini'
}
// Haiku 4.5 is available on all platforms (first-party, Foundry, Bedrock, Vertex)
return getModelStrings().haiku45