OpenAI
GPT-5.6 Terra
- Benchmark records
- 9
- Snapshot
- 2026-07-30
Independent model comparison
GPT-5.6 Terra vs Grok 4.20: evidence side by side
Compare the models using only evidence that can be identified and attributed. Exact benchmark matches appear first; independent facts and user reports remain separate and do not create an overall ranking.
Exact comparison coverage
No benchmark records currently share an exact reviewed comparison key.
Evidence strength
No exact benchmark match
Model-level evidence is kept separate until a compatible comparison record is available.
Models at a glance
Key differences
xAI
Grok 4.20
- Benchmark records
- 1
- Snapshot
- 2026-04-02
| Detail | GPT-5.6 Terra | Grok 4.20 |
|---|---|---|
| Provider |
OpenAI |
xAI |
| Release date Shown only where an exact reviewed release date is available. |
Not verified |
Not verified |
| Exact benchmark coverage Only records carrying the same reviewed comparison identity are counted. |
0 shared records |
0 shared records |
Price and speed appear only when an exact reviewed operational reference is attached to that model identity.
Primary comparison evidence
Exact matched benchmark evidence
A shared benchmark name is not enough. A result appears side by side only when both model records carry the same reviewed comparison key. Duplicate or unversioned records are omitted rather than guessed into alignment.
No exact benchmark match yet
Each model may still have useful individual evidence on its profile, but those records cannot be treated as a direct comparison until their benchmark and protocol identities align.
Secondary context · not head-to-head
Independent signals for each model
The sources below evaluated or discussed each model independently. Putting them in adjacent columns makes them easier to inspect, but it does not make their metrics, samples, or observations directly comparable.
Independent early-test reports
Early technical field tests from X
Editor-paraphrased reports from independent authors in each model's fixed 14-day launch window. These selectively surfaced anecdotes are not direct head-to-head tests unless they also appear in the dedicated direct-report section above.
GPT-5.6 Terra
No editor-reviewed X field-test paragraph is active for this model snapshot.
Grok 4.20
Early technical field tests
Early Grok 4.20 evidence came from two broad comparative exercises: a thirty-seven-model test of implicit understanding in text and a blind twenty-four-model OpenClaw evaluation. Those artifacts provide more structure than general launch reactions and make harness effects visible. They remain informal, tester-designed evaluations, so the evidence should be read as directional rather than representative.
Source venue: X · window: 2026-03-31 to 2026-04-14 · 2 tests · 2 independent authors · 2 with a method or artifact · identity reviewed
X field tests remain separate from Reddit community opinions, Artificial Analysis facts, and every scored benchmark.
How to read this comparison
Spring Prompt does not name an overall winner from unrelated benchmark scores, third-party metrics, Reddit opinions, or X field-test reports.
Different benchmarks measure different constructs and may use different populations, prompts, harnesses, model revisions, tools, and score scales. This page does not average those values or infer a winner from source coverage. Test both models on your own production work before making a consequential choice.