GPT-5.1 Codex High vs GPT-5.6 Sol: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Codex High | GPT-5.6 Sol |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | November 11, 2025 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 400K | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $1.25 | $5.00 |
| Output Price / 1M | $10.00 | $30.00 |
| Average Score | 1.0 | 0.6 |
Verdict
GPT-5.6 Sol leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.1 Codex High — 1.0, GPT-5.6 Sol — 0.6.
API Cost
GPT-5.1 Codex High is 3.1x cheaper: input $1.25/1M vs $5.00/1M tokens.
Context Window
GPT-5.6 Sol supports a larger context: 1M vs 400K tokens.
Recency
GPT-5.6 Sol is newer: released 7/9/2026 vs 11/11/2025.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — GPT-5.1 Codex High or GPT-5.6 Sol?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.1 Codex High or GPT-5.6 Sol?
GPT-5.1 Codex High is cheaper for input: $1.25 per 1M tokens vs $5.00.
Which has a larger context window — GPT-5.1 Codex High or GPT-5.6 Sol?
GPT-5.6 Sol supports a larger context: 1,050,000 tokens vs 400,000.
The GPT-5.1 Codex High and GPT-5.6 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-5.1 Codex High or GPT-5.6 Sol page. See also the complete list of AI model comparisons.