v2.5.1 (2026-07-06)

What's Changed

🐛 Bug Fixes

• fix(bedrock): handle toolResult attachment co-location per-model via bedrock_tool_result_colocatable_content by @Hasnaathussain in #6098
• fix(groq): map unified thinking setting to Groq reasoning_effort by @dsfaccini in #6231
• fix(evals): reject non-positive OnlineEvaluator.max_concurrency by @VectorPeak in #6267
• fix: write relative schema refs for AgentSpec files by @VectorPeak in #6251
• fix(agent): honor end_strategy="early" for NativeOutput by @Oxygen56 in #6279
• send retry prompt for empty model responses instead of silent resubmit by @dcosson in #5643
• Preserve FileUrl.force_download in UI round-trips by @HarperZ9 in #6205
• Exclude deprecated Bedrock gateway model anthropic.claude-3-5-sonnet-20240620-v1:0 by @ddanielcruzz in #6297
• fix: preserve union NativeOutput description instead of last member's docstring by @dsfaccini in #6265
• fix(bedrock): deliver unsupported tool-return media to models that isolate toolResult turns by @DouweM in #6259
• Revert "fix(agent): honor end_strategy="early" for NativeOutput" by @DouweM in #6301
• Accept thinking-only responses when output_type allows None by @kmike in #5146
• Omit empty ModelResponse from Mistral and Cohere request payloads by @DouweM in #6302

New Contributors

• @Hasnaathussain made their first contribution in #6098
• @saime428 made their first contribution in #6268
• @NotFoundOvO made their first contribution in #6285
• @dcosson made their first contribution in #5643
• @HarperZ9 made their first contribution in #6205
• @kmike made their first contribution in #5146

Full Changelog: v2.5.0...v2.5.1