Add Azure OpenAI Responses API support #92

yellowgolfball · 2026-02-10T23:46:28Z

Add Azure OpenAI Responses API Support

Overview

This PR adds full support for Azure OpenAI's Responses API by switching from the legacy AzureOpenAI SDK client to the standard OpenAI client with Azure's v1 endpoint format.

Problem

Oracle's existing Azure integration used the AzureOpenAI SDK client, which relies on the legacy API format that doesn't support the Responses API endpoint. This caused 404/405 errors when trying to use Oracle with Azure OpenAI.

Error encountered:

The Responses API returned 404/405 — your base URL/gateway probably lacks /v1/responses

Root Cause

Azure OpenAI's Responses API requires:

New v1 endpoint format: https://resource.openai.azure.com/openai/v1/
Authentication: api-key header (not Authorization: Bearer)
No API version query parameter in the URL

The AzureOpenAI SDK client uses:

Legacy endpoint format: https://resource.openai.azure.com/openai/deployments/{deployment}/...
API version as query parameter: ?api-version=2024-02-15-preview
Deployment-based paths that don't align with v1 spec

Solution

1. Switch to OpenAI Client with Custom Base URL

Replace AzureOpenAI client with standard OpenAI client configured for Azure:

// Construct Azure v1 base URL
const azureBaseUrl = options.azure.endpoint.replace(/\/$/, '') + '/openai/v1';

instance = new OpenAI({
  apiKey: 'dummy', // Required by SDK but we use api-key header instead
  baseURL: azureBaseUrl,
  defaultHeaders: {
    'api-key': key, // Azure authentication
  },
});

2. Add gpt-5.2-codex Model Support

Added model configuration with proper tokenizer and context limits
Fixed model name parsing (was hardcoded to return gpt-5.1-codex for any "codex" model)
Added type definitions and model mappings

3. Update API Version Documentation

Updated default API version from 2024-02-15-preview to 2025-04-01-preview (current documented version for Responses API)

Changes

Core Changes

src/oracle/client.ts: Switch to OpenAI client with v1 base URL and api-key header
src/oracle/config.ts: Add gpt-5.2-codex model configuration
src/oracle/types.ts: Add gpt-5.2-codex to KnownModelName
src/cli/options.ts: Fix model name parsing to support gpt-5.2-codex

Documentation & Tests

docs/openai-endpoints.md: Update API version to 2025-04-01-preview
bin/oracle-cli.ts: Clarify API version requirement in help text
tests/oracle/clientFactory.test.ts: Update test API version
src/oracle/gemini.ts: Add gpt-5.2-codex to model ID map

Testing

Tested on Azure OpenAI East US 2 with both gpt-5.2 and gpt-5.2-codex deployments:

✅ Simple queries (1.7-2.0s response time)
✅ File processing (19.9s for code review)
✅ Direct curl verification of Azure v1 Responses API endpoint

Breaking Changes

None. This is a purely additive change:

Existing non-Azure configurations remain unchanged
Azure users who update will gain Responses API support
No API changes required for existing users

Migration

Users with Azure OpenAI simply need to ensure they have a compatible API version:

export AZURE_OPENAI_ENDPOINT="https://your-resource.openai.azure.com"
export AZURE_OPENAI_API_VERSION="2025-04-01-preview"  # Updated
export AZURE_OPENAI_DEPLOYMENT="gpt-5.2-codex"
export AZURE_OPENAI_API_KEY="your-key"

References

Closes

Fixes issues with Azure OpenAI Responses API returning 404/405 errors.

Technical Details

Azure OpenAI Responses API Support - Change Documentation

Summary

This patch adds full support for Azure OpenAI Responses API by switching from the legacy AzureOpenAI SDK client to the standard OpenAI client with Azure's v1 endpoint format.

Problem

Oracle's existing Azure support used the AzureOpenAI client which relies on the legacy API format:

Endpoint: https://resource.openai.azure.com/
API Version: Query parameter (e.g., ?api-version=2024-02-15-preview)
Path: /openai/deployments/{deployment}/...

However, Azure's Responses API requires the new v1 endpoint format:

Base URL: https://resource.openai.azure.com/openai/v1/
No API version query parameter needed
Authentication: api-key header (not Authorization: Bearer)
Path: Standard OpenAI paths like /v1/responses

Changes Made

1. Client Initialization (`src/oracle/client.ts`)

Before:

if (options?.azure?.endpoint) {
  instance = new AzureOpenAI({
    apiKey: key,
    endpoint: options.azure.endpoint,
    apiVersion: options.azure.apiVersion,
    deployment: options.azure.deployment,
    timeout: httpTimeoutMs,
  });
}

After:

if (options?.azure?.endpoint) {
  // Azure Responses API requires using OpenAI client with /openai/v1 base URL
  // NOT the AzureOpenAI client which uses the legacy API format
  const azureBaseUrl = options.azure.endpoint.replace(/\/$/, '') + '/openai/v1';
  instance = new OpenAI({
    apiKey: 'dummy', // Required by SDK but we use api-key header instead
    timeout: httpTimeoutMs,
    baseURL: azureBaseUrl,
    defaultHeaders: {
      ...defaultHeaders,
      'api-key': key, // Azure uses api-key header, not Authorization Bearer
    },
  });
}

Why:

Azure's Responses API endpoint is /openai/v1/responses, not the deployment-based path
Must use api-key header for authentication, not Authorization: Bearer
The OpenAI client with custom baseURL properly constructs the v1 paths

2. Model Support - Add gpt-5.2-codex

2.1 Model Configuration (`src/oracle/config.ts`)

Added:

'gpt-5.2-codex': {
  model: 'gpt-5.2-codex',
  provider: 'openai',
  tokenizer: countTokensGpt5 as TokenizerFn,
  inputLimit: 272000,
  pricing: {
    inputPerToken: 1.5 / 1_000_000,
    outputPerToken: 12 / 1_000_000,
  },
  reasoning: { effort: 'high' },
},

Why: Adds support for Azure's gpt-5.2-codex deployment (code-optimized variant with extended context)

2.2 Type Definitions (`src/oracle/types.ts`)

Added: 'gpt-5.2-codex' to KnownModelName type union

2.3 Model Mapping (`src/oracle/gemini.ts`)

Added: 'gpt-5.2-codex': 'gpt-5.2-codex' to MODEL_ID_MAP

2.4 Model Name Parsing (`src/cli/options.ts`)

Before:

if (normalized.includes('codex')) {
  if (normalized.includes('max')) {
    throw new InvalidArgumentError('gpt-5.1-codex-max is not available yet.');
  }
  return 'gpt-5.1-codex';  // Always returned 5.1!
}

After:

if (normalized.includes('codex')) {
  if (normalized.includes('max')) {
    throw new InvalidArgumentError('gpt-5.1-codex-max is not available yet.');
  }
  // Check for 5.2-codex before defaulting to 5.1-codex
  if (normalized.includes('5.2') || normalized.includes('5-2')) {
    return 'gpt-5.2-codex';
  }
  return 'gpt-5.1-codex';
}

Why: Oracle was hardcoded to map any "codex" model to gpt-5.1-codex, breaking gpt-5.2-codex support

3. Documentation Updates

3.1 API Version (`docs/openai-endpoints.md`)

Changed: 2024-02-15-preview → 2025-04-01-preview

Why:

Original version predates Responses API support
Current documented preview version is 2025-04-01-preview

3.2 CLI Help Text (`bin/oracle-cli.ts`)

Before:

.option('--azure-api-version <version>', 'Azure OpenAI API Version.')

After:

.option('--azure-api-version <version>', 'Azure OpenAI API Version (default: 2025-04-01-preview; requires 2025-04-01-preview or newer for Responses API).')

Why: Documents the requirement clearly in help text

3.3 Test Fixtures (`tests/oracle/clientFactory.test.ts`)

Changed: Test API version from 2024-08-01-preview to 2025-04-01-preview

Why: Keep tests aligned with current API version

Testing Results

All tests performed on Azure East US 2 with API key 6FEH...WWWi:

Test 1: Simple Query (gpt-5.2-codex)

oracle --models "gpt-5.2-codex" -p "What is 2+2? Answer with just the number." --wait

Result: ✅ "4" (1.7s, $0.0047)

Test 2: File Review (gpt-5.2-codex)

oracle --models "gpt-5.2-codex" -p "review this code" --file "AGENTS.md" --wait

Result: ✅ Detailed review with 756 tokens (19.9s, $0.0158)

Test 3: Simple Query (gpt-5.2)

oracle --models "gpt-5.2" -p "What is 3+3? Answer with just the number." --wait

Result: ✅ "6" (2.0s, $0.0056)

Test 4: Summarization (gpt-5.2)

oracle --models "gpt-5.2" -p "Summarize this README in 10 words or less" --file "README.md" --wait

Result: ✅ Summary (2.2s, $0.0105)

Verification with curl

Direct Azure Responses API call (bypassing Oracle):

curl -X POST \
  "https://micha-ml8dixtm-eastus2.openai.azure.com/openai/v1/responses" \
  -H "api-key: 6FEH...WWWi" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.2-codex",
    "instructions": "You are a helpful assistant.",
    "input": [{"role": "user", "content": "What is 2+2?"}]
  }'

Result: ✅ {"output": [{"text": "2+2 = 4."}], "status": "completed"}

Confirms Azure endpoint supports Responses API with correct format.

Breaking Changes

None. This is purely additive:

Existing non-Azure configurations unchanged
Azure configurations will now work with Responses API
New model (gpt-5.2-codex) added without breaking existing models

Migration Path for Users

For users with Azure OpenAI:

Old setup (broken with Responses API):

export AZURE_OPENAI_ENDPOINT="https://resource.openai.azure.com/"
export AZURE_OPENAI_API_VERSION="2024-02-15-preview"
export AZURE_OPENAI_DEPLOYMENT="gpt-4"

New setup (works with Responses API):

export AZURE_OPENAI_ENDPOINT="https://resource.openai.azure.com"  # No trailing slash
export AZURE_OPENAI_API_VERSION="2025-04-01-preview"  # Updated version
export AZURE_OPENAI_DEPLOYMENT="gpt-5.2-codex"  # Now supports gpt-5.2-codex

The SDK will automatically construct: https://resource.openai.azure.com/openai/v1/

References

Files Changed

src/oracle/client.ts - Switch to OpenAI client with v1 base URL
src/oracle/config.ts - Add gpt-5.2-codex model config
src/oracle/types.ts - Add gpt-5.2-codex to KnownModelName
src/oracle/gemini.ts - Add gpt-5.2-codex to MODEL_ID_MAP
src/cli/options.ts - Fix model name parsing for gpt-5.2-codex
docs/openai-endpoints.md - Update API version documentation
bin/oracle-cli.ts - Update CLI help text
tests/oracle/clientFactory.test.ts - Update test API version

Commit Message

fix: add Azure OpenAI Responses API support with v1 endpoint

- Use OpenAI client with /openai/v1 base URL instead of AzureOpenAI client
- Add api-key header for Azure authentication (not Authorization Bearer)
- Add gpt-5.2-codex model support (config, types, model mapping)
- Fix model name parsing to recognize gpt-5.2-codex
- Update documented API version to 2025-04-01-preview

Azure Responses API requires the new v1 endpoint format, not the legacy
API version-based format. The AzureOpenAI SDK client uses the old format
which doesn't work with Responses API.

Tested with: Azure East US 2, gpt-5.2-codex deployment
Successfully calling Responses API with proper authentication and model naming.

Next Steps

Review this document and the code changes
Test with your Azure deployments
Push to fork: git push origin fix/azure-responses-api-support
Create PR to upstream: https://github.com/steipete/oracle

- Correct API version to 2025-04-01-preview (2025-12-01-preview doesn't exist) - Document that yellowgolfball/oracle fork now fully supports Azure Responses API - Update memory with correct API version - Note that fork uses v1 endpoint format, not legacy API version format The fork has been successfully patched and tested with Azure OpenAI East US 2 using gpt-5.2-codex deployment. All Responses API calls working correctly. Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

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yellowgolfball commented Feb 10, 2026

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yellowgolfball commented Feb 10, 2026

Add Azure OpenAI Responses API Support

Overview

Problem

Root Cause

Solution

1. Switch to OpenAI Client with Custom Base URL

2. Add gpt-5.2-codex Model Support

3. Update API Version Documentation

Changes

Core Changes

Documentation & Tests

Testing

Breaking Changes

Migration

References

Closes

Technical Details

Azure OpenAI Responses API Support - Change Documentation

Summary

Problem

Changes Made

1. Client Initialization (src/oracle/client.ts)

2. Model Support - Add gpt-5.2-codex

2.1 Model Configuration (src/oracle/config.ts)

2.2 Type Definitions (src/oracle/types.ts)

2.3 Model Mapping (src/oracle/gemini.ts)

2.4 Model Name Parsing (src/cli/options.ts)

3. Documentation Updates

3.1 API Version (docs/openai-endpoints.md)

3.2 CLI Help Text (bin/oracle-cli.ts)

3.3 Test Fixtures (tests/oracle/clientFactory.test.ts)

Testing Results

Test 1: Simple Query (gpt-5.2-codex)

Test 2: File Review (gpt-5.2-codex)

Test 3: Simple Query (gpt-5.2)

Test 4: Summarization (gpt-5.2)

Verification with curl

Breaking Changes

Migration Path for Users

For users with Azure OpenAI:

References

Files Changed

Commit Message

Next Steps

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Reviewers

Assignees

Labels

Projects

Milestone

Development

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1 participant

1. Client Initialization (`src/oracle/client.ts`)

2.1 Model Configuration (`src/oracle/config.ts`)

2.2 Type Definitions (`src/oracle/types.ts`)

2.3 Model Mapping (`src/oracle/gemini.ts`)

2.4 Model Name Parsing (`src/cli/options.ts`)

3.1 API Version (`docs/openai-endpoints.md`)

3.2 CLI Help Text (`bin/oracle-cli.ts`)

3.3 Test Fixtures (`tests/oracle/clientFactory.test.ts`)