opencode/packages/llm/STATUS.md

LLM Provider Parity Status

Last reviewed: 2026-07-08

This file tracks the gap between the native @opencode-ai/llm package and the AI SDK provider packages that opencode still depends on for many catalog/runtime paths.

Existing Status Sources

File	What it tracks	Limitation
packages/llm/DESIGN.md	Future clean-break API proposal, currently named @opencode-ai/ai in the draft.	Not a provider parity tracker.
packages/llm/example/call-sites.md	Route/value/provider-facade migration checklist and call-site sketches.	Architecture migration only; not AI SDK package parity.
specs/v2/provider-model.md	V2 catalog endpoint schema and current Session runner adaptation surface.	Runner-specific; not a native LLM package status matrix.

Current Implementation Snapshot

Native slice	Source	Current state	Main gaps
OpenAI Chat	src/protocols/openai-chat.ts, src/providers/openai.ts	Usable. Streams text, reasoning deltas, tool calls, usage, images, and common generation controls.	No typed structured-output / response_format path. Limited typed OpenAI option surface compared with SDK escape hatches.
OpenAI Responses HTTP	src/protocols/openai-responses.ts, src/providers/openai.ts	Usable. Supports hosted-tool event surfacing, reasoning replay metadata, GPT-5 defaults, and cache usage.	No explicit previous_response_id path. Typed options cover only a subset of Responses fields. Structured output is still mostly synthetic-tool based.
OpenAI Responses WebSocket	src/protocols/openai-responses.ts, src/route/transport/websocket.ts	Present as OpenAI.responsesWebSocket(...).	Runner/catalog support explicitly must not downgrade WebSocket routes; broader runtime selection is not complete.
OpenAI-compatible Chat	src/protocols/openai-compatible-chat.ts, src/providers/openai-compatible.ts	Usable for generic Chat and several profiles: Baseten, Cerebras, DeepInfra, DeepSeek, Fireworks, Groq, TogetherAI.	No OpenAI-compatible Responses protocol/facade. Family quirks are mostly endpoint defaults, not full typed behavior.
Anthropic Messages	src/protocols/anthropic-messages.ts, src/providers/anthropic.ts	Usable. Supports tools, thinking, cache control, images, server-hosted tool events, and usage.	Provider option surface is small. Beta/header handling, metadata, and newer Messages fields need a typed parity pass.
Gemini Developer API	src/protocols/gemini.ts, src/providers/google.ts	Usable for Google API key flow. Supports text, images, tools, thinking signatures, and cache usage.	This is not Vertex. Typed provider options are narrow; many Gemini request fields currently require raw http.body overlays.
Bedrock Converse	src/protocols/bedrock-converse.ts, src/providers/amazon-bedrock.ts	Partial but real. Supports AWS event-stream framing, SigV4 with supplied credentials, bearer auth, tools, reasoning signatures, media, cache points, and recorded tests.	Native facade does not mirror the AI SDK plugin's default AWS credential chain/profile behavior. Runner/catalog mapping is missing. Guardrails, inference profiles, region-specific model ID fixes, and model-specific request fields need a parity pass.
Azure OpenAI	src/providers/azure.ts using OpenAI Chat/Responses protocols	Partial. Supports resource/base URL setup, API key auth, API version query, Chat, and Responses selectors.	Core runner does not map @ai-sdk/azure to this native facade. AAD/token auth and Azure-specific endpoint variants need review.
Cloudflare AI Gateway / Workers AI	src/providers/cloudflare.ts	Present via OpenAI-compatible Chat routes.	Useful but not part of the critical AI SDK replacement set yet. Needs per-product recorded coverage before relying on it broadly.
OpenRouter	src/providers/openrouter.ts	Present with OpenRouter-specific usage/reasoning/prompt-cache options over Chat.	Responses-style OpenRouter support is absent.
xAI	src/providers/xai.ts	Present with Responses and Chat selectors.	Needs package-parity review against the AI SDK xAI provider.
GitHub Copilot	src/providers/github-copilot.ts	Present as explicit-base-URL OpenAI Chat/Responses facade.	Runtime/catalog integration remains specialized and should stay separate from public OpenAI-compatible defaults.

V2 Runner Status

packages/core/src/session/runner/model.ts currently resolves only this native subset from catalog aisdk metadata:

Catalog API	Native route used today
aisdk:@ai-sdk/openai	OpenAIResponses.route
aisdk:@ai-sdk/anthropic	AnthropicMessages.route
aisdk:@ai-sdk/openai-compatible with explicit URL	OpenAICompatibleChat.route

Everything else currently fails with SessionRunnerModel.UnsupportedApiError when the V2 native runner tries to resolve it. This includes @ai-sdk/google, @ai-sdk/google-vertex, @ai-sdk/google-vertex/anthropic, @ai-sdk/azure, @ai-sdk/amazon-bedrock, and @ai-sdk/amazon-bedrock/mantle.

AI SDK Package Parity Matrix

AI SDK package	Intended native target	Status	Biggest gaps
@ai-sdk/openai	OpenAI.chat, OpenAI.responses, OpenAI.responsesWebSocket	Partial / usable	Add complete typed option coverage, structured output strategy, explicit Responses continuation support, and runner route selection between Chat/Responses/WebSocket.
@ai-sdk/openai-compatible	Generic OpenAI-compatible Chat plus future Responses	Partial	Add OpenAI-compatible Responses. Decide per-family namespace/profile behavior for providers that support Responses versus Chat only.
@ai-sdk/anthropic	AnthropicMessages	Partial / usable	Finish Messages API parity for headers/betas/metadata/newer fields and document hosted-tool continuation expectations.
@ai-sdk/google	Gemini Developer API	Partial / usable	Add typed options for safety, response schema/modalities, cached content, grounding/search/code execution, and non-text output modes where supported.
@ai-sdk/google-vertex	Vertex Gemini namespace/facade	Missing	Implement Vertex endpoint derivation, ADC/OAuth auth, project/location/env resolution, OpenAI-compatible Vertex endpoint handling, and runner/catalog mapping.
@ai-sdk/google-vertex/anthropic	Anthropic Messages over Vertex namespace/facade	Missing	Implement Vertex Anthropic endpoint/auth selection, regional endpoint behavior, and compatibility with Anthropic Messages lowering/parsing.
@ai-sdk/azure	Azure OpenAI Chat/Responses facade	Partial	Map runner/catalog metadata to native Azure, handle resourceName/baseURL/apiVersion variants, add AAD/token auth story, and verify Chat vs Responses deployment selection.
@ai-sdk/amazon-bedrock	Bedrock Converse	Partial	Add default AWS credential chain/profile support, region/inference-profile model ID handling, provider option parity via additionalModelRequestFields, guardrails/performance config, and runner/catalog mapping.
@ai-sdk/amazon-bedrock/mantle	Bedrock Mantle OpenAI-compatible Chat/Responses namespace	Missing	Decide native Mantle shape, likely separate from Converse because it uses OpenAI-compatible Chat/Responses semantics over Bedrock. Add package mapping and tests.

Highest-Risk Gaps

1. Runner support is narrower than the LLM package. The package has native provider facades for Google, Azure, and Bedrock, but the V2 Session runner only maps OpenAI, Anthropic, and explicit OpenAI-compatible Chat from aisdk catalog metadata.
2. OpenAI-compatible is Chat-only. We need a separate OpenAI-compatible Responses slice for providers/deployments that expose /responses, not an overloaded Chat route.
3. Bedrock native auth is not AI SDK parity. The AI SDK plugin uses the default AWS provider chain, profile, container credentials, and Bedrock bearer token env behavior. Native Bedrock currently expects explicit credentials or bearer auth on the facade.
4. Vertex is not implemented natively. Google Gemini Developer API exists, but Vertex Gemini and Vertex Anthropic are separate auth/endpoint products and should be separate namespaces/facades.
5. Azure is only a provider facade, not a full runtime replacement. Native Azure exists, but the catalog runner does not select it, and token auth/resource variants need review.
6. Provider option typing is uneven. OpenAI, Anthropic, Gemini, Bedrock, and OpenRouter each expose a small typed subset plus raw HTTP overlays; this is useful but not equivalent to AI SDK provider option coverage.
7. Structured output is not provider-native yet. LLM.generateObject still uses a synthetic tool strategy, while the future design expects native structured output where reliable and tool fallback where needed.
8. Package/namespace boundaries for the current native loading set are explicit in docs and exports. Other exported provider facades are not catalog package entrypoints until they implement the contract. Missing native API boundaries remain for OpenAI-compatible Responses, Vertex Gemini, Vertex Anthropic Messages, and Bedrock Mantle.
9. Recorded coverage is uneven. OpenAI, Anthropic, Gemini, Bedrock Converse, Cloudflare, OpenRouter, and several OpenAI-compatible Chat providers have cassettes. Azure, Vertex, and Mantle need first-class recorded scenarios before switching defaults.

Native Namespace Shape

These are implementation/API slices, not separate npm packages.

API slice	Package-like entrypoint	Purpose
OpenAI Chat	@opencode-ai/llm/providers/openai/chat	OpenAI /chat/completions semantics.
OpenAI Responses	@opencode-ai/llm/providers/openai/responses	OpenAI /responses semantics with HTTP/WebSocket selected through settings.
OpenAI-compatible Chat	@opencode-ai/llm/providers/openai-compatible	Generic OpenAI-compatible /chat/completions.
OpenAI-compatible Responses	Missing	Generic OpenAI-compatible /responses.
Anthropic Messages	@opencode-ai/llm/providers/anthropic	Anthropic Messages API.
Gemini Developer API	@opencode-ai/llm/providers/google	Google AI Studio Gemini API.
Vertex Gemini	Missing	Vertex Gemini API.
Vertex Anthropic Messages	Missing	Vertex-hosted Anthropic Messages API.
Bedrock Converse	@opencode-ai/llm/providers/amazon-bedrock	AWS Bedrock Converse API.
Bedrock Mantle	Missing	AWS Bedrock Mantle OpenAI-compatible APIs.
Azure OpenAI Chat	@opencode-ai/llm/providers/azure/chat	Azure specialization of OpenAI Chat.
Azure OpenAI Responses	@opencode-ai/llm/providers/azure/responses	Azure specialization of OpenAI Responses.

Suggested Next Work Slices

1. Add native runner/catalog mappings for @ai-sdk/azure, @ai-sdk/google, and @ai-sdk/amazon-bedrock where the existing native facades are already close.
2. Implement OpenAICompatibleResponses as a separate protocol/route/facade instead of extending Chat.
3. Bring Bedrock native auth/config to AI SDK parity: region, profile, default AWS credential chain, bearer token env, endpoint override, and cross-region inference profile handling.
4. Add Vertex Gemini and Vertex Anthropic native facades with ADC/OAuth auth and project/location endpoint derivation.
5. Add Bedrock Mantle as a separate OpenAI-compatible Bedrock namespace after deciding whether it uses Chat, Responses, or both by model.
6. Expand typed provider options from the existing V1 lowerer knowledge in packages/core/src/v1/config/provider-options.ts before adding more raw overlay examples.
7. Add recorded provider tests for Azure, Vertex Gemini, Vertex Anthropic, Bedrock credential-chain behavior, and Mantle before making native runtime the default for those packages.