GPT-5.1 Medium vs GPT-6 Sol
GPT-5.1 Medium and GPT-6 Sol are closely matched at 30.9 and 47.8 on the LLM Stats Score. GPT-5.1 Medium is 1.2x cheaper per token.
OpenAI · OpenAI · Updated for 2026
Which is better?
GPT-5.1 Medium and GPT-6 Sol are closely matched on the overall LLM Stats Score at 30.9 and 47.8.
On price, GPT-5.1 Medium is roughly 1.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6 Sol also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.1 Medium
- cost matters — it's about 1.2x cheaper per token
Choose GPT-6 Sol
- you process long inputs — it offers a 1,050,000 token context window
- you want the most recent training data — it shipped Sep 2026
At a glance
The differences that matter most.
Individual benchmarks
1 reported for GPT-5.1 Medium · 5 for GPT-6 Sol
GPT-5.1 Medium and GPT-6 Soldon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.1 Medium ($1.25/1M tokens) is 1.6x cheaper than GPT-6 Sol ($2.00/1M tokens).
For output processing, GPT-5.1 Medium ($10.00/1M tokens) costs the same as GPT-6 Sol ($10.00/1M tokens).
In conclusion, GPT-6 Sol is more expensive than GPT-5.1 Medium.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6 Sol accepts 1,050,000 input tokens compared to GPT-5.1 Medium's 400,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5.1 Medium and GPT-6 Sol support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.1 Medium
GPT-6 Sol
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-5.1 Medium was released on 2025-11-12, while GPT-6 Sol was released on 2026-09-22.
GPT-6 Sol is 10 months newer than GPT-5.1 Medium.
Nov 12, 2025
11 months ago
Sep 22, 2026
1 months ago
10mo newerKnowledge Cutoff
When training data ends
GPT-6 Sol has a documented knowledge cutoff of 2026-04-20, while GPT-5.1 Medium's cutoff date is not specified.
We can confirm GPT-6 Sol's training data extends to 2026-04-20, but cannot make a direct comparison without GPT-5.1 Medium's cutoff date.
—
Apr 2026
Provider Availability
GPT-5.1 Medium is available from OpenAI. GPT-6 Sol is available from OpenAI.
GPT-5.1 Medium
GPT-6 Sol
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.1 Medium and GPT-6 Sol side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.1 Medium vs GPT-6 Sol.