Model Comparison

GPT-5.6 Sol vs GPT-5.5Which is better in 2026?

GPT-5.6 Sol significantly outperforms across most benchmarks. GPT-5.6 Sol and GPT-5.5 cost the same.

Verdict: GPT-5.6 Sol vs GPT-5.5 — which is better?

GPT-5.6 Sol (by OpenAI) and GPT-5.5 (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

GPT-5.6 Sol outperforms in 8 benchmarks (BrowseComp, FrontierMath, GDPval-AA, GPQA, Graphwalks BFS >128k, MRCR v2 (8-needle), SWE-Bench Pro, Toolathlon), while GPT-5.5 is better at 1 benchmark (MMMU-Pro). GPT-5.6 Sol significantly outperforms across most benchmarks.

Choose GPT-5.6 Sol if…

  • you want the strongest raw capability — it leads on 8 of 9 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose GPT-5.5 if…

  • you want predictable pricing at $5.00/M input and $30.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

9 benchmarks

GPT-5.6 Sol outperforms in 8 benchmarks (BrowseComp, FrontierMath, GDPval-AA, GPQA, Graphwalks BFS >128k, MRCR v2 (8-needle), SWE-Bench Pro, Toolathlon), while GPT-5.5 is better at 1 benchmark (MMMU-Pro).

GPT-5.6 Sol significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

For input processing, GPT-5.6 Sol ($5.00/1M tokens) costs the same as GPT-5.5 ($5.00/1M tokens).

For output processing, GPT-5.6 Sol ($30.00/1M tokens) costs the same as GPT-5.5 ($30.00/1M tokens).

In conclusion, GPT-5.6 Sol and GPT-5.5 cost the same.*

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

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
OpenAI
GPT-5.6 Sol
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
OpenAI
GPT-5.5
Input tokens$5.00
Output tokens$30.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

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-5.6 Sol
Input1,050,000 tokens
Output128,000 tokens
OpenAI
GPT-5.5
Input1,050,000 tokens
Output128,000 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.6 Sol and GPT-5.5 support multimodal inputs.

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

GPT-5.6 Sol

Text
Images
Audio
Video

GPT-5.5

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-5.6 Sol

Proprietary

Closed source

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.6 Sol was released on 2026-07-09, while GPT-5.5 was released on 2026-04-23.

GPT-5.6 Sol is 3 months newer than GPT-5.5.

GPT-5.6 Sol

Jul 9, 2026

1 weeks ago

2mo newer
GPT-5.5

Apr 23, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-5.6 Sol has a knowledge cutoff of 2026-02-16, while GPT-5.5 has a cutoff of 2025-12-01.

GPT-5.6 Sol has more recent training data (up to 2026-02-16), making it potentially better informed about events through that date compared to GPT-5.5 (2025-12-01).

GPT-5.6 Sol

Feb 2026

2 mo newer
GPT-5.5

Dec 2025

Provider Availability

GPT-5.6 Sol is available from OpenAI. GPT-5.5 is available from OpenAI.

GPT-5.6 Sol

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M

GPT-5.5

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Higher BrowseComp score (90.4% vs 84.4%)
Higher FrontierMath score (89.0% vs 35.4%)
Higher GDPval-AA score (58.3% vs 37.8%)
Higher GPQA score (94.6% vs 93.6%)
Higher Graphwalks BFS >128k score (90.7% vs 45.4%)
Higher MRCR v2 (8-needle) score (91.5% vs 74.0%)
Higher SWE-Bench Pro score (64.6% vs 58.6%)
Higher Toolathlon score (58.0% vs 55.6%)
OpenAI
Higher MMMU-Pro score (83.2% vs 83.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.6 Sol and GPT-5.5 side-by-side, then vote on the output you prefer.

GPT-5.6 Sol
✓ Preferred
GPT-5.5
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.6 Sol
OpenAI
GPT-5.5

FAQ

Common questions about GPT-5.6 Sol vs GPT-5.5.

Which is better, GPT-5.6 Sol or GPT-5.5?

GPT-5.6 Sol significantly outperforms across most benchmarks. GPT-5.6 Sol is made by OpenAI and GPT-5.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.6 Sol compare to GPT-5.5 in benchmarks?

GPT-5.6 Sol scores Connectors: 100.0%, Capture-the-Flag Challenges (Internal): 96.7%, HealthBench Consensus: 95.5%, GPQA: 94.6%, MRCR v2 (8-needle): 91.5%. GPT-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

Is GPT-5.6 Sol cheaper than GPT-5.5?

Both models cost $5.00 per million input tokens.

What are the context window sizes for GPT-5.6 Sol and GPT-5.5?

GPT-5.6 Sol supports 1.1M tokens and GPT-5.5 supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

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