GPT-5.1
Sharper GPT-5 generation for coding, product work, and tool-assisted tasks
ECI STANDING#49 of 266
SCORE149.64148.45–151.03 CI
FRONTIER LAGLaunched 3.2 months behindScores about what GPT-5 did in August 2025.
SCORES LIKE THESE MODELSKimi K2.7 CodeMoonshot · Jun 2026150.07GPT-5OpenAI · Aug 2025150.0GLM-5.1Z.ai (Zhipu AI) · Apr 2026149.71
Full Epoch Capabilities Index ranking ↗Qwen 3.6 Max (Preview)Alibaba · Apr 2026149.27
From the lab
Launch announcement · Nov 13, 2025Introducing GPT-5.1 for developersRelated article · Nov 12, 2025GPT-5.1: A smarter, more conversational ChatGPTRELEASE DATENov 13, 2025
WEIGHTSClosed weights
CONTEXT WINDOW400K
MAX OUTPUT128K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image
OUTPUTStext
Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.