grok-4 vs gpt-5.1
Side-by-side comparison of grok-4 and gpt-5.1 — benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. gpt-5.1 outperforms grok-4 on 6 of 7 shared benchmarks.
xAI Corp.
grok-4
Input / 1M
$3.00
Output / 1M
$15.00
Context
256K
Model ID
xai/grok-4
gpt-5.1
Input / 1M
$1.25
Output / 1M
$10.00
Context
400K
Model ID
openai/gpt-5.1
Benchmark comparison
MMLU Proknowledge
grok-487.5%
gpt-5.189.4%
GPQA Diamondreasoning
grok-487.5%
gpt-5.183.2%
HumanEvalcoding
grok-493.8%
gpt-5.194.7%
SWE-Bench Verifiedcoding
grok-472.5%
gpt-5.176.8%
MATHmath
grok-494.1%
gpt-5.194.8%
AIME 2024math
grok-490.1%
gpt-5.190.1%
MMMUmultimodal
grok-477.9%
gpt-5.180.3%
LiveBenchreasoning
grok-475.4%
gpt-5.176.2%
τ-bench Retailagentic
grok-4—
gpt-5.173.5%
Scores sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and don't capture every aspect of model quality.
Pricing & specifications
| grok-4 | gpt-5.1 | |
|---|---|---|
| Input price / 1M | $3.00 | $1.25 |
| Output price / 1M | $15.00 | $10.00 |
| Context window | 256K tokens | 400K tokens |
| Max output | — | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | — | Yes |
| Prompt caching | Yes | Yes |
| Computer use | Yes | — |
| Provider | xAI Corp. | OpenAI Inc. |
Questions people ask
Is grok-4 better than gpt-5.1?
gpt-5.1 outperforms grok-4 on 6 of 7 shared benchmarks. See the benchmark comparison above for specifics — grok-4 and gpt-5.1 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper — grok-4 or gpt-5.1?
gpt-5.1 is cheaper. grok-4 costs $3.00/$15.00 per 1M input/output tokens, while gpt-5.1 costs $1.25/$10.00.
Can I use grok-4 and gpt-5.1 through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch — "xai/grok-4" or "openai/gpt-5.1" — no other code changes needed.
What are the context windows?
grok-4 supports up to 256K tokens of context. gpt-5.1 supports up to 400K tokens. Longer context means you can feed larger documents or codebases in a single prompt, though quality often degrades past 128K for most models.
Switch between grok-4 and gpt-5.1 with one line of code
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