GPT-5 vs GPT-5.1
GPT-5 and GPT-5.1 are closely matched at 33.4 and 36.2 on the LLM Stats Score. GPT-5 and GPT-5.1 cost the same.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-5 and GPT-5.1 are closely matched on the overall LLM Stats Score at 33.4 and 36.2.
In the 9 individual benchmarks reported for both models, GPT-5.1 wins 6; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5
- you want predictable pricing at $1.25/M input and $10.00/M output
Choose GPT-5.1
- you value its reported benchmark strengths — it wins 6 of 9 exact shared results
- you want the most recent training data — it shipped Nov 2025
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
34 reported for GPT-5 · 9 for GPT-5.1
GPT-5 outperforms in 3 benchmarks (AIME 2025, Tau2 Retail, Tau2 Telecom), while GPT-5.1 is better at 5 benchmarks (FrontierMath, GPQA, MMMU, SWE-Bench Verified, Tau2 Airline).
GPT-5.1 has a slight edge in benchmark performance.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5 ($1.25/1M tokens) costs the same as GPT-5.1 ($1.25/1M tokens).
For output processing, GPT-5 ($10.00/1M tokens) costs the same as GPT-5.1 ($10.00/1M tokens).
In conclusion, GPT-5 and GPT-5.1 cost the same.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 400,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5 and GPT-5.1 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5
GPT-5.1
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
GPT-5 was released on 2025-08-07, while GPT-5.1 was released on 2025-11-13.
GPT-5.1 is 3 months newer than GPT-5.
Aug 7, 2025
1.2 years ago
Nov 13, 2025
11 months ago
3mo newerKnowledge Cutoff
When training data ends
Both models have the same knowledge cutoff date of 2024-09-30.
They should have similar awareness of historical events and information up to this date.
Sep 2024
Sep 2024
Provider Availability
GPT-5 is available from OpenAI. GPT-5.1 is available from OpenAI.
GPT-5
GPT-5.1
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5 and GPT-5.1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5 vs GPT-5.1.