docs(index.md): initial draft release notes

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+---
+title: v1.67.0-stable - Unified Responses API
+slug: v1.67.0-stable
+date: 2025-04-19T10:00:00
+authors:
+  - name: Krrish Dholakia
+    title: CEO, LiteLLM
+    url: https://www.linkedin.com/in/krish-d/
+    image_url: https://media.licdn.com/dms/image/v2/D4D03AQGrlsJ3aqpHmQ/profile-displayphoto-shrink_400_400/B4DZSAzgP7HYAg-/0/1737327772964?e=1749686400&v=beta&t=Hkl3U8Ps0VtvNxX0BNNq24b4dtX5wQaPFp6oiKCIHD8
+  - name: Ishaan Jaffer
+    title: CTO, LiteLLM
+    url: https://www.linkedin.com/in/reffajnaahsi/
+    image_url: https://pbs.twimg.com/profile_images/1613813310264340481/lz54oEiB_400x400.jpg
+
+tags: ["sso", "unified_file_id", "cost_tracking", "security"]
+hide_table_of_contents: false
+---
+
+## New Models / Updated Models
+
+- **OpenAI**
+    1. gpt-4.1 pricing - https://github.com/BerriAI/litellm/pull/9990
+    2. o4 - correctly map o4 to openai o_series model 
+- **Azure AI**
+    1. Phi-4 output cost per token fix - https://github.com/BerriAI/litellm/pull/9880
+    2. Responses API support https://github.com/BerriAI/litellm/pull/10116
+- **Anthropic**
+    1. redacted message thinking support - https://github.com/BerriAI/litellm/pull/10129
+- **Cohere**
+    1. `/v2/chat` Passthrough endpoint support w/ cost tracking - https://github.com/BerriAI/litellm/pull/9997
+- **Azure**
+    1. Support azure tenant_id/client_id env vars - https://github.com/BerriAI/litellm/pull/9993
+    2. Fix response_format check for 2025+ api versions - https://github.com/BerriAI/litellm/pull/9993
+- **VLLM**
+    1. Files - Support 'file' message type for VLLM video url's - https://github.com/BerriAI/litellm/pull/10129
+    2. Passthrough - new `/vllm/` passthrough endpoint support https://github.com/BerriAI/litellm/pull/10002
+- **Mistral**
+    1. new `/mistral` passthrough endpoint support https://github.com/BerriAI/litellm/pull/10002
+- **AWS**
+    1. New mapped bedrock regions - https://github.com/BerriAI/litellm/pull/9430
+- **VertexAI / Google AI Studio**
+    1. Gemini - Response format - Retain schema field ordering for google gemini and vertex by specifying propertyOrdering - https://github.com/BerriAI/litellm/pull/9828
+    2. Gemini-2.5-flash - return reasoning content
+    3. Gemini-2.5-flash - pricing + model information - https://github.com/BerriAI/litellm/pull/10125
+    4. Passthrough - new `/vertex_ai/discovery` route - enables calling AgentBuilder API routes https://github.com/BerriAI/litellm/pull/10084
+- **Fireworks AI**
+    1. return tool calling responses in `tool_calls` field (fireworks incorrectly returns this as a json str in content)  - https://github.com/BerriAI/litellm/pull/10130
+- **Triton**
+    1. Remove fixed remove bad_words / stop words from `/generate` call - https://github.com/BerriAI/litellm/pull/10163
+- **Other**
+    1. Support for all litellm providers on Responses API (works with Codex) - https://github.com/BerriAI/litellm/pull/10132
+    2. Fix combining multiple tool calls in streaming response - https://github.com/BerriAI/litellm/pull/10040
+
+
+## Spend Tracking Improvements
+
+- **Cost Control** - inject cache control points in prompt for cost reduction https://github.com/BerriAI/litellm/pull/10000
+- **Spend Tags** - spend tags in headers - support x-litellm-tags even if tag based routing not enabled
+- **Gemini-2.5-flash** - support cost calculation for reasoning tokens 
+
+## Management Endpoints / UI
+- **Users**
+    1. Show created_at and updated_at on users page - https://github.com/BerriAI/litellm/pull/10033
+- **Virtual Keys**
+    1. Filter by key alias - https://github.com/BerriAI/litellm/pull/10085
+- **Usage Tab**
+    1. Team based usage
+        1. New `LiteLLM_DailyTeamSpend` Table for aggregate team based usage logging - https://github.com/BerriAI/litellm/pull/10039
+        2. New Team based usage dashboard + new `/team/daily/activity` API - https://github.com/BerriAI/litellm/pull/10081
+        3. Return team alias on /team/daily/activity API - https://github.com/BerriAI/litellm/pull/10157
+        4. allow internal user view spend for teams they belong to - https://github.com/BerriAI/litellm/pull/10157
+        5. allow viewing top keys by team
+    2. Tag Based Usage
+        1. New `LiteLLM_DailyTagSpend` Table for aggregate tag based usage logging - https://github.com/BerriAI/litellm/pull/10071
+        2. Restrict to only Proxy Admins - https://github.com/BerriAI/litellm/pull/10157
+        3. allow viewing top keys by tag
+        4. Return tags passed in request (i.e. dynamic tags) on `/tag/list` 
+        5. 
+    3. Track prompt caching metrics in daily user, team, tag tables - https://github.com/BerriAI/litellm/pull/10029
+    4. Show usage by key (on all up, team, and tag usage dashboards) - https://github.com/BerriAI/litellm/pull/10157
+    5. swap old usage with new usage tab
+- **Models**
+    1. Make columns resizable/hideable - https://github.com/BerriAI/litellm/pull/10119
+- **API Playground**
+    1. Allow internal user to call api playground - https://github.com/BerriAI/litellm/pull/10157
+- **SCIM**
+    1. Add LiteLLM SCIM Integration for Team and User management - https://github.com/BerriAI/litellm/pull/10072
+
+
+## Logging / Guardrail Integrations
+- **GCS**
+    1. Fix gcs pub sub logging with env var GCS_PROJECT_ID - https://github.com/BerriAI/litellm/pull/10042
+- **AIM**
+    1. Add litellm call id passing to Aim guardrails on pre and post-hooks calls - https://github.com/BerriAI/litellm/pull/10021
+- **Azure blob storage**
+    1. Ensure logging works in high throughput scenarios - https://github.com/BerriAI/litellm/pull/9962
+
+## General Proxy Improvements
+
+- **Support setting `litellm.modify_params` via env var** - https://github.com/BerriAI/litellm/pull/9964
+- **Model Discovery** - Check provider’s `/models` endpoints when calling proxy’s `/v1/models` endpoint - https://github.com/BerriAI/litellm/pull/9958
+- **`/utils/token_counter`** - fix retrieving custom tokenizer for db models - https://github.com/BerriAI/litellm/pull/10047
+- **Prisma migrate** - handle existing columns in db table - https://github.com/BerriAI/litellm/pull/10138
+