Changelog

Product changes

• May Release Spotlight blog post — Published the May Release Spotlight covering speech and transcription APIs, Model Fusion, private models, enterprise workspace controls, and new model launches.
• Fixed: model-specific default parameters not shown on API tab — The Parameters table on model detail pages now displays the model’s actual default overrides (e.g. top_p: 0.95) instead of generic global defaults. Docs
• /llms.txt and /llms-full.txt now resolve at the domain root — openrouter.ai/llms.txt and openrouter.ai/llms-full.txt now redirect to their generated equivalents under /docs/, following the llms.txt specification.
• Fixed: verbosity parameter default in docs — The verbosity parameter reference no longer lists medium as the default; the effective default varies by upstream provider.

Product changes

• Fusion Router documentation and model page — Added a dedicated Fusion Router documentation page and a model page describing the full panel → judge → synthesis pipeline, configuration options, and failure behavior.
• MiniMax M3 reasoning support — MiniMax M3 now supports the thinking parameter, enabling extended reasoning for complex tasks.
• Fixed: Azure forbidden error mapping — Azure provider responses with a forbidden status in server-sent events are now correctly surfaced as HTTP 403 instead of being misclassified.

New models

• MiniMax: MiniMax M3

Product changes

• Fallback errors in error metadata — When all provider fallbacks fail, the error response metadata now includes a previous_errors array showing every attempted provider’s error code, message, and name, making multi-provider failures easier to debug.
• Fixed: 404 page layout — The 404 page no longer displays visual artifacts (stray borders, duplicate footer, off-center content).
• Fixed: multipart/form-data error code — Sending multipart/form-data to JSON-only endpoints (e.g. speech-to-text) now returns a clear 400 Bad Request instead of a misleading 500 Internal Server Error.
• Fixed: playground reasoning panel scroll — Opening the reasoning panel in the playground now scrolls to the top instead of an arbitrary position.

Product changes

• Preset ID in generation responses — The GET /api/v1/generation endpoint now returns preset_id when a preset was used, letting you trace which preset produced each completion. Docs
• Fixed: activity overview date range — The activity overview widget no longer breaks when selecting a date range exceeding 365 days.

Product changes

• IP address filtering for enterprise plans — Enterprise organizations can now restrict all API key usage to approved IP address ranges from Privacy settings, reducing the blast radius of leaked keys.
• Negation filters in activity and logs — Filters now support exclusion — click “is” on any filter chip to toggle it to “is not”, letting you exclude specific models, providers, API keys, or workspaces from your view. Docs
• Presets: Responses API support — Creating presets from inference now supports the Responses API via POST /api/v1/presets/:slug/responses, and new documentation covers creating and updating presets directly from inference request bodies. Docs
• Prompt caching: session_id sticky routing documentation — Added docs on using session_id to control sticky provider routing, which activates on any successful request rather than requiring a cache hit. Docs
• Anthropic thinking tokens in API responses — API responses for Anthropic models now include output_tokens_details.thinking_tokens, providing precise reasoning token counts for Claude Opus 4.8 and later.
• Fixed: Responses API streaming crashes in OpenAI SDKs — Streaming keep-alive heartbeats on the Responses API no longer cause union_tag_invalid (Python) or invalid_union (TypeScript) validation errors in the OpenAI SDKs.

New models

• Anthropic: Claude Opus 4.8
• Anthropic: Claude Opus 4.8 (Fast)
• StepFun: Step 3.7 Flash

Product changes

• Series B announcement — Published the $113M Series B announcement.
• API tab redesign on model pages — Each model’s API tab now shows the /responses and /messages endpoint references alongside /chat/completions, making it easier to discover alternative request formats. Docs
• Presets: Anthropic Messages API support — Created presets from inference now support POST /api/v1/presets/:slug/messages, the Anthropic Messages counterpart to the existing chat/completions preset route. Docs
• Stream inactivity timeout — Streaming requests that produce no chunks for 30 seconds are now aborted immediately instead of waiting up to 5 minutes, catching dead connections and empty streams faster.
• Guardrails API documentation — Added a guide for updating your workspace default guardrail programmatically via the API. Docs
• Fixed: EU routing for non-Google models on Vertex — Non-Google models (Claude, Llama, DeepSeek, etc.) routed through eu.openrouter.ai now use the correct endpoint path, fixing 400 errors caused by a hostname/path mismatch.

Product changes

• Model comparison page — Compare up to five models side by side on pricing, context length, and benchmark scores with the new comparison tool, including a “Highlight best” toggle to call out the top value in each row.
• Redesigned model detail API tab — The API tab on each model page now walks you through numbered steps (get an API key, make a request, enable streaming) with an endpoint reference and interactive parameters table.
• Rankings daily dataset endpoint — A new GET /api/v1/datasets/rankings-daily endpoint returns the top-50 models by daily token volume, matching the data behind the public rankings chart. SDK reference
• IP allowlist enforcement — API keys configured with an IP allowlist now actively block requests from non-allowlisted IPs with a 403 response, upgrading the previous observe-only mode. Docs
• Auto router cost_quality_tradeoff parameter — The auto router now accepts a cost_quality_tradeoff integer (0–10) instead of the previous binary tradeoff, giving finer control over the cost-versus-quality balance when routing requests. Docs
• Fixed: dashboard not refreshing on account switch — Switching between accounts in the dashboard now correctly remounts the page so data reflects the selected account.
• Fixed: Bedrock BYOK region prefix mismatch — Bring-your-own-key Bedrock requests now normalize the inference profile region prefix to match the customer’s configured region, fixing “invalid model identifier” errors when the endpoint and key regions differed.

Product changes

• Activity and Logs in workspace sidebar — Organizations with multiple workspaces now see Activity and Logs links directly in each workspace’s sidebar, pre-filtered to that workspace.
• API key links in activity logs — The Activity page and generation detail pane now display the API key name as a clickable link to its detail page, with org-scoped access control.
• Fixed: video playback errors in Logs — Video generation results in Logs now show specific error messages based on the failure type (expired, codec unsupported, network error) and always provide a Download button as fallback.

Product changes

• Fixed: activity chart color consistency — Spend, Requests, and Tokens charts on the activity page now use consistent colors for the same series across all three charts.

Product changes

• Compare page benchmark visualization — The compare page now displays provider-coded landscape benchmark charts for Intelligence, Coding, and Agentic metrics with author-brand color gradients, replacing the previous data grid.
• Redesigned model selector — The model selector now features full-screen search, improved filtering, and integrated apps discovery, making it faster to find and switch between models across the site.