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November 14, 2025

OpenAI GPT-5.1 support

Hassieb Pakzad

Langfuse now supports OpenAI GPT-5.1 with day 1 support for the LLM playground, LLM-as-a-judge evaluations, and comprehensive cost tracking.

OpenAI has released GPT-5.1, bringing enhanced capabilities and performance improvements to their model lineup. We’re excited to announce day 1 support for GPT-5.1 across Langfuse’s core features.

Start experimenting with GPT-5.1 now in the Langfuse LLM playground, leverage it to power your LLM-as-a-judge evaluations, and monitor usage with our comprehensive cost tracking capabilities.

Try it out

• Langfuse LLM playground
• Langfuse LLM-as-a-judge
• Langfuse model usage and cost tracking