GPT-5.6 Terra vs Grok 4.5: Specs & Benchmark Comparison
GPT-5.6 Terra 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 Terra leads on 5 of them, Grok 4.5 on 3. The widest gaps are on DeepSWE, where GPT-5.6 Terra scores 69.6% against 53.0%; DeepSWE 1.1, where GPT-5.6 Terra scores 70.0% against 54.0%. Averaged across everything we track, GPT-5.6 Terra sits at 59.0% and Grok 4.5 at 52.9%.
On price the two are close: GPT-5.6 Terra costs $2 per million input tokens and $12 per million output tokens, Grok 4.5 $2 and $6. GPT-5.6 Terra 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 Terra | 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 | $2.00 | $2.00 |
| Output Price / 1M | $12.00 | $6.00 |
| Average Score | 59.0% | 52.9% |
| Benchmarks | ||
| DeepSWE | 69.6% | 53.0% |
| DeepSWE 1.1 | 70.0% | 54.0% |
| Terminal-Bench 4.0 | 21.5% | 12.4% |
| Terminal-Bench 2.1 | 87.4% | 83.0% |
| SWE-Bench Pro | 63.4% | 65.0% |
| FrontierCode 1.1 | 41.3% | 42.4% |
| Artificial Analysis | 55.0% | 54.0% |
| GPQA | 92.9% | 93.0% |
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 Terra — 0.6, Grok 4.5 — 0.5.
Grok 4.5 is 1.8x cheaper: input $2.00/1M vs $2.00/1M tokens.
GPT-5.6 Terra supports a larger context: 1M vs 500K tokens.
Both models were released around the same time: 7/9/2026 and 7/16/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — GPT-5.6 Terra or Grok 4.5?
Which model is cheaper — GPT-5.6 Terra or Grok 4.5?
Which has a larger context window — GPT-5.6 Terra or Grok 4.5?
The GPT-5.6 Terra 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 Terra or Grok 4.5 page. See also the complete list of AI model comparisons.