The AI arena is free today

Open Superagent

GPT-5.5 Pro vs GPT-6.1 Sol

GPT-5.5 Pro and GPT-6.1 Sol are closely matched at 45.5 and 53.9 on the LLM Stats Score. GPT-6.1 Sol is 16.9x cheaper per token.

OpenAI · OpenAI · Updated for 2026

Which is better?

GPT-5.5 Pro and GPT-6.1 Sol are closely matched on the overall LLM Stats Score at 45.5 and 53.9.

On price, GPT-6.1 Sol is roughly 16.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-5.5 Pro

  • you want predictable pricing at $30.00/M input and $180.00/M output

Choose GPT-6.1 Sol

  • cost matters — it's about 16.9x cheaper per token
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

GPT-5.5 Pro
OpenAI
GPT-6.1 Sol
OpenAI
Core performance indexes
LLM Stats Score
45.5
#36
53.9
#7
Reasoning
45.4
#34
51.7
#8
Agents
30.2
#39
38.6
#8
Cost, coverage & limits
Benchmark wins
—
—
Input price
$30.00 / M
$2.00 / M
Output price
$180.00 / M
$10.00 / M
Context window
1,050,000
1,050,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT-5.5 Pro
GPT-6.1 Sol
Math
37.3#32
34.9#46
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

5 reported for GPT-5.5 Pro · 17 for GPT-6.1 Sol

No common benchmarks found

GPT-5.5 Pro and GPT-6.1 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

GPT-6.1 Sol costs less

For input processing, GPT-5.5 Pro ($30.00/1M tokens) is 15.0x more expensive than GPT-6.1 Sol ($2.00/1M tokens).

For output processing, GPT-5.5 Pro ($180.00/1M tokens) is 18.0x more expensive than GPT-6.1 Sol ($10.00/1M tokens).

In conclusion, GPT-5.5 Pro is more expensive than GPT-6.1 Sol.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Oct 08 2026 • llm-stats.com
OpenAI
GPT-5.5 Pro
Input tokens$30.00
Output tokens$180.00
Best providerOpenAI
OpenAI
GPT-6.1 Sol
Input tokens$2.00
Output tokens$10.00
Best providerOpenAI
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,050,000 tokens. Both models can generate responses up to 128,000 tokens.

OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
OpenAI
GPT-6.1 Sol
Input1,050,000 tokens
Output128,000 tokens
Thu Oct 08 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-5.5 Pro and GPT-6.1 Sol support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-5.5 Pro

Text
Images
Audio
Video

GPT-6.1 Sol

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5.5 Pro

Proprietary

Closed source

GPT-6.1 Sol

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.5 Pro was released on 2026-04-23, while GPT-6.1 Sol was released on 2026-09-29.

GPT-6.1 Sol is 5 months newer than GPT-5.5 Pro.

GPT-5.5 Pro

Apr 23, 2026

5 months ago

GPT-6.1 Sol

Sep 29, 2026

1 weeks ago

5mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a knowledge cutoff of 2025-12-01, while GPT-6.1 Sol has a cutoff of 2026-04-30.

GPT-6.1 Sol has more recent training data (up to 2026-04-30), making it potentially better informed about events through that date compared to GPT-5.5 Pro (2025-12-01).

GPT-5.5 Pro

Dec 2025

GPT-6.1 Sol

Apr 2026

4 mo newer

Provider Availability

GPT-5.5 Pro is available from OpenAI. GPT-6.1 Sol is available from OpenAI.

GPT-5.5 Pro

openai logo
OpenAI
Input Price:Input: $30.00/1MOutput Price:Output: $180.00/1M

GPT-6.1 Sol

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $10.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-5.5 Pro and GPT-6.1 Sol side-by-side, then vote on the output you prefer.

GPT-5.5 Pro
✓ Preferred
GPT-6.1 Sol
Open in Playground

FAQ

Common questions about GPT-5.5 Pro vs GPT-6.1 Sol.

Which is better, GPT-5.5 Pro or GPT-6.1 Sol?

GPT-5.5 Pro and GPT-6.1 Sol are closely matched on the LLM Stats Score at 45.5 and 53.9. GPT-5.5 Pro is made by OpenAI and GPT-6.1 Sol is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-5.5 Pro compare to GPT-6.1 Sol in benchmarks?

GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%. GPT-6.1 Sol scores FrontierMath Tier 4 (v2): 100.0%, HealthBench Consensus: 96.0%, MMMU-Pro: 86.0%, DeepSWE 1.1: 75.2%, SimpleQA Verified: 73.9%.

Is GPT-5.5 Pro cheaper than GPT-6.1 Sol?

GPT-6.1 Sol is 15.0x cheaper for input tokens. GPT-5.5 Pro costs $30.00/M input and $180.00/M output via openai. GPT-6.1 Sol costs $2.00/M input and $10.00/M output via openai.

What are the context window sizes for GPT-5.5 Pro and GPT-6.1 Sol?

GPT-5.5 Pro supports 1.1M tokens and GPT-6.1 Sol supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.5 Pro and GPT-6.1 Sol?

Key differences include LLM Stats Score (45.5 vs 53.9), input pricing ($30.00 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

Related comparisons