GPT-5.6 Terra vs GPT-6 Sol: Specs & Benchmark Comparison
GPT-5.6 Terra and GPT-6 Sol both come from OpenAI, GPT-5.6 Terra was released in July 2026, and GPT-6 Sol followed 2 months later in September 2026.
The two models share 4 published benchmarks. GPT-6 Sol leads on 3 of them, GPT-5.6 Terra on 1. The widest gaps are on OSWorld 2.0, where GPT-6 Sol scores 64.4% against 50.2%; FrontierCode 1.1, where GPT-6 Sol scores 49.3% against 41.3%. Averaged across everything we track, GPT-5.6 Terra sits at 59.0% and GPT-6 Sol at 54.4%.
On price the two are close: GPT-5.6 Terra costs $2 per million input tokens and $12 per million output tokens, GPT-6 Sol $2 and $10. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | GPT-5.6 Terra | GPT-6 Sol |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | July 9, 2026 | September 22, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $2.00 | $2.00 |
| Output Price / 1M | $12.00 | $10.00 |
| Average Score | 59.0% | 54.4% |
| Benchmarks | ||
| OSWorld 2.0 | 50.2% | 64.4% |
| FrontierCode 1.1 | 41.3% | 49.3% |
| Agents' Last Exam | 50.4% | 56.4% |
| DeepSWE 1.1 | 70.0% | 68.8% |
Visual Benchmark Comparison
Verdict
GPT-6 Sol leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-5.6 Terra — 0.6, GPT-6 Sol — 0.5.
GPT-6 Sol is 1.2x cheaper: input $2.00/1M vs $2.00/1M tokens.
Same context size: 1M tokens.
GPT-6 Sol is newer: released 9/22/2026 vs 7/9/2026.
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Frequently Asked Questions
Which is better for coding — GPT-5.6 Terra or GPT-6 Sol?
Which model is cheaper — GPT-5.6 Terra or GPT-6 Sol?
Which has a larger context window — GPT-5.6 Terra or GPT-6 Sol?
The GPT-5.6 Terra and GPT-6 Sol comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.6 Terra or GPT-6 Sol page. See also the complete list of AI model comparisons.