GPT-5.6 Sol vs Grok 4.5: Specs & Benchmark Comparison
GPT-5.6 Sol is developed by OpenAI, while Grok 4.5 comes from xAI. Both were released in July 2026.
The two models share 8 published benchmarks. GPT-5.6 Sol leads on 7 of them, Grok 4.5 on 1. The widest gaps are on Terminal-Bench 4.0, where GPT-5.6 Sol scores 37.3% against 12.4%; DeepSWE, where GPT-5.6 Sol scores 72.7% against 53.0%. Averaged across everything we track, GPT-5.6 Sol sits at 63.9% and Grok 4.5 at 52.9%.
Grok 4.5 is the cheaper API at $2 per million input tokens and $6 per million output tokens, roughly 3 times cheaper than GPT-5.6 Sol at $5 and $30. GPT-5.6 Sol takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. Both accept text and images as input.
| Characteristic | GPT-5.6 Sol | Grok 4.5 |
|---|---|---|
| Company | OpenAI | xAI |
| Release Date | July 9, 2026 | July 16, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 500K |
| Context (output) | 128K | — |
| Input Price / 1M | $5.00 | $2.00 |
| Output Price / 1M | $30.00 | $6.00 |
| Average Score | 63.9% | 52.9% |
| Benchmarks | ||
| Terminal-Bench 4.0 | 37.3% | 12.4% |
| DeepSWE | 72.7% | 53.0% |
| DeepSWE 1.1 | 73.0% | 54.0% |
| Terminal-Bench 2.1 | 88.8% | 83.0% |
| FrontierCode 1.1 | 47.5% | 42.4% |
| Artificial Analysis | 59.0% | 54.0% |
| GPQA | 94.6% | 93.0% |
| SWE-Bench Pro | 64.6% | 65.0% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: GPT-5.6 Sol — 0.6, Grok 4.5 — 0.5.
Grok 4.5 is 4.4x cheaper: input $2.00/1M vs $5.00/1M tokens.
GPT-5.6 Sol supports a larger context: 1M vs 500K tokens.
Both models were released around the same time: 7/9/2026 and 7/16/2026.
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Frequently Asked Questions
Which is better for coding — GPT-5.6 Sol or Grok 4.5?
Which model is cheaper — GPT-5.6 Sol or Grok 4.5?
Which has a larger context window — GPT-5.6 Sol or Grok 4.5?
The GPT-5.6 Sol and Grok 4.5 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 Sol or Grok 4.5 page. See also the complete list of AI model comparisons.