Data points: 112
Model compare
The readout for GPT-5.1 and Grok 4.5, before the detailed comparison sheet.
Weighted outcome: Grok 4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Grok 4.5
Grok 4.5 has the higher weighted result; Model A / B score 20 to 80.
Evidence depth
112 data points
Includes 22 benchmark rows, 1 audit samples, and 6 provider examples.
Selection signal
Start with Grok 4.5
The charts below split 29 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for GPT-5.1 and Grok 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | Grok 4.5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 20.0 pts | 80.0 pts |
| Benchmark category leads | 0 categories | 4 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 500K tokens |
| Max output | 128K tokens | No data |
| Modalities | Input ImageTextFile Output Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | GPT-5.1 | Grok 4.5 |
|---|---|---|
| Developer | OpenAI | xAI |
| Released | Nov 2025 | Jul 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | Grok |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1 | x-ai/grok-4.5 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and Grok 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 has these operational advantages: Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage.
Grok 4.5
Grok 4.5 leads these benchmark categories: Agents, Coding, Reasoning, Knowledge.
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-5.1
52
Avg. score
Grok 4.5
56.5
Grok 4.5 leads by 14.4
Grok 4.5 leads by 9.8
Grok 4.5 leads by 1.8
Grok 4.5 leads by 4.0
GPT-5.1
No data
Grok 4.5
GPT-5.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
56.0
Rank #47/90 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner68.0
Rank #20/90 · confidence 2 · eval date 2026-07-08
GPT-5.1
winner$1.25/M
Rank #110/169 · confidence 4
Grok 4.5
$2.00/M
Rank #129/169 · confidence 4
GPT-5.1
$10.00/M
Rank #126/169 · confidence 4
Grok 4.5
winner$6.00/M
Rank #110/169 · confidence 4
GPT-5.1
$3.44/M
Rank #123/169 · confidence 4
Grok 4.5
winner$3.00/M
Rank #117/169 · confidence 4
GPT-5.1
winner75.0
Rank #3/94 · confidence 1 · eval date 2025-11-13
Grok 4.5
67.7
Rank #31/94 · confidence 2 · eval date 2026-07-08
GPT-5.1
87.3%
Rank #36/194 · confidence 4
Grok 4.5
winner93.1%
Rank #6/194 · confidence 4
GPT-5.1
26.5%
Rank #45/193 · confidence 4
Grok 4.5
winner40.3%
Rank #13/193 · confidence 4
GPT-5.1
4.9
Rank #38/77 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner15.4
Rank #16/77 · confidence 2 · eval date 2026-07-08
GPT-5.1
49.4
Rank #36/64 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner72.5
Rank #9/64 · confidence 2 · eval date 2026-07-08
GPT-5.1
43.3%
Rank #46/191 · confidence 4
Grok 4.5
winner54.1%
Rank #10/191 · confidence 4
GPT-5.1
43.3
Rank #49/101 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner54.1
Rank #12/101 · confidence 2 · eval date 2026-07-08
GPT-5.1
5.6
Rank #23/34 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner26.4
Rank #5/34 · confidence 2 · eval date 2026-07-08
GPT-5.1
87.3
Rank #39/101 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner93.1
Rank #6/101 · confidence 2 · eval date 2026-07-08
GPT-5.1
37.6
Rank #35/95 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner52.1
Rank #7/95 · confidence 2 · eval date 2026-07-08
GPT-5.1
36.9
Rank #46/104 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner53.8
Rank #8/104 · confidence 2 · eval date 2026-07-08
GPT-5.1
26.5
Rank #43/101 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner40.3
Rank #12/101 · confidence 2 · eval date 2026-07-08
GPT-5.1
51.3
Rank #67/95 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner53.5
Rank #64/95 · confidence 2 · eval date 2026-07-08
GPT-5.1
1212.0
Rank #41/69 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner1321.0
Rank #5/69 · confidence 2 · eval date 2026-07-08
GPT-5.1
75.5
Rank #26/61 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner80.4
Rank #9/61 · confidence 2 · eval date 2026-07-08
GPT-5.1
21.0
Rank #41/60 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner45.7
Rank #8/60 · confidence 2 · eval date 2026-07-08
GPT-5.1
24.4
Rank #40/55 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner51.4
Rank #9/55 · confidence 2 · eval date 2026-07-08
GPT-5.1
988.0
Rank #40/60 · confidence 1 · eval date 2025-11-13
Grok 4.5
winner1528.0
Rank #9/60 · confidence 2 · eval date 2026-07-08
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | Grok 4.5 |
|---|---|---|
Winner: Grok 4.5 | GPT-5.1 gpt-5-1 No audit yet | Grok 4.5 grok-4.5 Audit score 87 788486100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.1 | Grok 4.5 |
|---|---|---|
5 tests | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.1 speed / latency 152 tok/s / 936ms input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request | Grok 4.5 grok-4.5 speed / latency No data input / output $0/request |
Weighted outcome: Grok 4.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
