v2.10.0 (2026-07-14)

What's Changed

🚀 Features

• Make message_history provider-valid out of the box (repair tool-call/result pairing) by @DouweM in #6319
• Add support for OpenAI background mode and handle Anthropic stop_reason=pause_turn by @DouweM in #6303

🐛 Bug Fixes

• Fix has_values() returning True for all-zero usage details by @sean-kim05 in #6466
• Fix RenamedToolset silently dropping a tool on a name collision by @sean-kim05 in #6462
• Preserve invalid UTF-8 bytes in instrumentation serialization by @alexmojaki in #6483
• Fix event-loop affinity in run_stream_sync by @adtyavrdhn in #6454
• Attach xAI ToolCallPart to the preceding reasoning message by @dsfaccini in #5924
• Filter unconfigured Anthropic native tool calls by @hxaxd in #6463
• Fix DeferredToolResults resume when an output tool call was settled in the same batch as deferred calls by @DouweM in #6491

📦 Dependencies

• Bump transformers floor to >=5.5.0 for CVE-2026-5241 by @hramezani in #6482

New Contributors

• @sean-kim05 made their first contribution in #6466
• @ShawnChen-Sirius made their first contribution in #6467
• @deepakdevp made their first contribution in #4718
• @hxaxd made their first contribution in #6463

Full Changelog: v2.9.1...v2.10.0