2.51.0

New Features ✨

Openai

• feat(openai): Set system instruction attribute for Responses API by @alexander-alderman-webb in #5376
• feat(openai): Set system instruction attribute for Completions API by @alexander-alderman-webb in #5358
• feat(integrations): OpenAI/OpenAI Agents detect and report the time to first token metric (TTFT) as gen_ai.response.time_to_first_token by @constantinius in #5348

Openai Agents

• feat(openai-agents): Set system instruction attribute on gen_ai.chat spans by @alexander-alderman-webb in #5370
• feat(openai-agents): Set system instruction attribute by @alexander-alderman-webb in #5355
• feat(integrations): openai-agents streaming support by @constantinius in #5291

Other

• feat(ai): Add original input length meta attribute by @alexander-alderman-webb in #5375
• feat(anthropic): Set system instruction attribute by @alexander-alderman-webb in #5353
• feat(asyncio): Allow to turn task spans off by @sentrivana in #5367
• feat(gen_ai): add function set_conversation_id and managing functions on the Scope and apply it on the Span on .finish() by @constantinius in #5362
• feat(google-genai): Set system instruction attribute by @alexander-alderman-webb in #5354
• feat(langchain): Set system instruction attribute by @alexander-alderman-webb in #5357
• feat(pydantic-ai): Set system instruction attribute by @alexander-alderman-webb in #5356
• feat(transport): Report 413 responses for oversized envelopes by @alexander-alderman-webb in #5380

Bug Fixes 🐛

• fix(ai): Keep single content input message by @alexander-alderman-webb in #5345

Internal Changes 🔧

• ci(release): Fix changelog-preview permissions by @BYK in #5368
• ref: Replace set_data_normalized() with Span.set_data() for system instructions by @alexander-alderman-webb in #5374
• ci: Fix path in AI integration tests by @alexander-alderman-webb in #5347