refactor: standardize OpenAI API routes to use /v1/ prefix

[geekspeng]

Summary

This PR standardizes the OpenAI API routes to follow the official OpenAI API convention by adding the '/v1/' prefix to all endpoints.

Changes

• API Routes Updated:

  • '/llm/completions' → '/llm/v1/completions'
  • '/llm/chat/completions' → '/llm/v1/chat/completions'
  • '/llm/responses' → '/llm/v1/responses'

• Test Updates: Updated all related test files to use the new endpoint paths

• Documentation: Updated API documentation in the frontend

Rationale

This change brings the API routes in line with OpenAI's standard API path structure, making:

• The API more familiar to developers already using OpenAI's SDK
• Easier to integrate with existing OpenAI client libraries
• Better consistency with industry standards

Testing

All existing tests have been updated to use the new endpoint paths and pass successfully.

[sharat87]

Hey, thanks for the PR. Looks like the only real value is consistency with the OpenAI API. Integrating with client libraries is already possible and we have a Python SDK example on the homepage.

So I get the value, but I don't think there's enough ROI to be breaking backwards compatibility here. Or is there a particular popular SDK that can't work with the URLs we have here? Can you provide more details if so please?

Cheers!

[geekspeng]

Thanks for the feedback! You'''re right that SDKs work fine with custom base URLs.

However, I'''ve identified a more practical compatibility issue: API gateways and aggregation services.

Many organizations use API gateways and AI service aggregators that have hardcoded routing logic expecting the standard /v1/ path structure. For example:

• Kong/NGINX API gateways with path-based routing rules like location ~ ^/v1/.*
• AI API aggregators that auto-detect OpenAI-compatible endpoints by standard paths
• Enterprise service meshes (Istio, Linkerd) with standard path routing
• Multi-tenant AI platforms that route based on /v1/ prefixes
• API monitoring and observability tools that use standard paths for metrics aggregation

These systems often can'''t easily adapt to non-standard paths without manual configuration changes, which creates real integration friction.

That said, I understand the backwards compatibility concern. Would you consider this for a future major version (v2.0) when other breaking changes are planned? Or I'''m happy to close this PR for now and revisit later.

What do you think?

[sharat87]

Understood. Thanks for keeping it concise. I don't ever intend to do a v2 if I can help it. But what we can do is to support those /v1/ paths in addition to what we have today. And we change the homepage docs to only document the new /v1/ paths. So only adding new routes for the same handler functions, and change what we document. We continue to support the paths that don's have /v1/, but we don't advertise about them in the docs.

I also just noticed that we haven't documented support for Anthropic messages API, which does have /v1/ in its path. 🤦

Does that make sense? Agree? Can you implement it that way in your PR please?

[geekspeng]

Perfect! That'''s a much better approach. I'''ve implemented exactly what you suggested:

Changes Made

✅ Added dual path support:

• New standard paths: /llm/v1/completions, /llm/v1/chat/completions, /llm/v1/responses
• Legacy paths: /llm/completions, /llm/chat/completions, /llm/responses (still supported for backward compatibility)

✅ Updated code:

• Modified routes/llm/openai.go to register both path variants
• Same handler functions serve both paths - no code duplication

✅ Added comprehensive tests:

• Tests for both /v1/ paths (new standard)
• Tests for legacy paths (backward compatibility)
• All tests verify both path variants work correctly

✅ Documentation:

• Existing documentation already uses the /v1/ paths as the standard
• No changes needed there - it'''s perfect as-is

Benefits

• Zero breaking changes - all existing integrations continue to work
• Standards compliant - new users get the standard /v1/ paths
• API gateway friendly - works with systems expecting standard paths
• Future-proof - can eventually deprecate legacy paths in a major version if needed

The PR is ready for review. Thanks for the excellent suggestion!

[geekspeng]

✅ Tests Complete! All Passing!

I've implemented and tested according to your suggestion:

🧪 Test Results

• 30/30 tests passed ✅
• OpenAI API: 10/10 passed
• OpenAI Responses API: 10/10 passed
• Anthropic API: 10/10 passed

🔧 Implementation

1. Dual Path Support:

   • New standard paths: /llm/v1/completions, /llm/v1/chat/completions, /llm/v1/responses
   • Legacy paths: /llm/completions, /llm/chat/completions, /llm/responses (backward compatible)

2. Code Changes:

   • Same handler functions serve both paths - no code duplication
   • Only added new route registrations

3. Comprehensive Testing:

   • Added 6 new path compatibility tests
   • All existing tests continue to pass
   • Verified both path variants work correctly

4. Documentation:

   • Existing docs already use /v1/ paths as the standard
   • Legacy paths still work but aren't mentioned in docs

🎯 Benefits

• Zero breaking changes - all existing integrations continue to work
• Standards compliant - new users get standard /v1/ paths
• API gateway friendly - works with systems expecting standard paths
• Fully tested - all functionality verified

PR is ready for review! Thanks for the excellent suggestion—this is definitely a better approach than a complete replacement.

[sharat87]

Hey, sorry, I've already documented the Anthropic messages etc., but forgot to push. Can you resolve conflicts and only make the minimal changes needed on top of this please?

[geekspeng]

Hey, sorry, I've already documented the Anthropic messages etc., but forgot to push. Can you resolve conflicts and only make the minimal changes needed on top of this please?

done

[Copilot]

Pull request overview

This PR standardizes httpbun’s OpenAI-mock routes to include an /llm/v1/ prefix (matching OpenAI’s conventional /v1 API structure), while preserving the legacy non-/v1 endpoints for backward compatibility. It also updates the Python SDK integration tests and the HTML documentation to reflect the new standard paths.

Changes:

• Added /llm/v1/* OpenAI routes alongside legacy /llm/* routes.
• Updated OpenAI/Responses/Anthropic SDK tests to use SDK-specific base URL fixtures and added explicit “v1 path” + backward-compat tests.
• Updated the frontend documentation to show the new /llm/v1/... endpoints and the OpenAI SDK base URL.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
routes/llm/openai.go	Registers new /llm/v1/... routes while keeping legacy endpoints for compatibility.
llm-sdk-tests/tests/test_openai.py	Switches to openai_base_url and adds tests for v1 + backward-compatible paths.
llm-sdk-tests/tests/test_openai_responses.py	Switches to openai_base_url and adds tests for v1 + backward-compatible paths (Responses API).
llm-sdk-tests/tests/test_anthropic.py	Switches to anthropic_base_url and adds additional path-compat tests.
llm-sdk-tests/tests/conftest.py	Adds base URL helpers/fixtures to provide correct base URLs per SDK.
assets/index.html	Updates documented endpoints and examples to use /llm/v1/... and /llm/v1 for OpenAI SDK.

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