Data points: 129
Model compare
The readout for GPT-5.1 and Kimi K2.5, before the detailed comparison sheet.
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1
GPT-5.1 has the higher weighted result; Model A / B score 61.3 to 38.7.
Evidence depth
129 data points
Includes 32 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 38 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 Kimi K2.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | Kimi K2.5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 61.3 pts | 38.7 pts |
| Benchmark category leads | 4 categories | 2 categories |
| Operational advantages | First-token latency, Free providers | Cheapest input price, Average speed, Provider coverage |
| Context window | 400K tokens | 262.1K tokens |
| Max output | 128K tokens | 262.1K tokens |
| 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 | Kimi K2.5 |
|---|---|---|
| Developer | OpenAI | MoonshotAI |
| Released | Nov 2025 | Jan 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | Other |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1 | moonshotai/kimi-k2.5 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and Kimi K2.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Agents, Coding, Knowledge, Math) and operational dimensions (First-token latency, Free providers).
Kimi K2.5
Kimi K2.5 is stronger in benchmark categories (Reasoning, Instruction following) and operational dimensions (Cheapest input price, Average speed, Provider coverage).
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
Kimi K2.5
49.8
GPT-5.1 leads by 7.9
GPT-5.1 leads by 0.5
Kimi K2.5 leads by 3.2
GPT-5.1 leads by 7.0
GPT-5.1 leads by 4.8
Kimi K2.5
Kimi K2.5
Kimi K2.5 leads by 0.3
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
56.0
Rank #45/84 · confidence 1 · eval date 2025-11-13
Kimi K2.5
56.0
Rank #45/84 · confidence 4 · eval date 2026-02-01
GPT-5.1
41.75 s
Rank #116/137 · confidence 4
Kimi K2.5
winner1.10 s
Rank #42/137 · confidence 4
GPT-5.1
winner110.2 tok/s
Rank #57/137 · confidence 4
Kimi K2.5
45.4 tok/s
Rank #126/137 · confidence 4
GPT-5.1
41.75 s
Rank #129/137 · confidence 4
Kimi K2.5
winner1.10 s
Rank #68/137 · confidence 4
GPT-5.1
$1.25/M
Rank #107/162 · confidence 4
Kimi K2.5
winner$0.600/M
Rank #80/162 · confidence 4
GPT-5.1
$3.44/M
Rank #117/162 · confidence 4
Kimi K2.5
winner$1.20/M
Rank #85/162 · confidence 4
GPT-5.1
$10.00/M
Rank #120/162 · confidence 4
Kimi K2.5
winner$3.00/M
Rank #85/162 · confidence 4
GPT-5.1
winner75.0
Rank #3/89 · confidence 1 · eval date 2025-11-13
Kimi K2.5
65.3
Rank #44/89 · confidence 4 · eval date 2026-02-01
GPT-5.1
87.0%
Rank #12/125 · confidence 4
Kimi K2.5
winner87.1%
Rank #11/125 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
Kimi K2.5
78.9%
Rank #79/188 · confidence 4
GPT-5.1
winner4.9
Rank #34/73 · confidence 1 · eval date 2025-11-13
Kimi K2.5
3.1
Rank #41/73 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
Kimi K2.5
12.3%
Rank #84/187 · confidence 4
GPT-5.1
winner24.6
Rank #18/33 · confidence 1 · eval date 2025-11-13
Kimi K2.5
17.5
Rank #23/33 · confidence 2 · eval date 2026-02-01
GPT-5.1
43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner49.0
Rank #25/96 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner49.4
Rank #32/58 · confidence 1 · eval date 2025-11-13
Kimi K2.5
46.8
Rank #35/58 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner43.3%
Rank #42/185 · confidence 4
Kimi K2.5
39.6%
Rank #76/185 · confidence 4
GPT-5.1
winner12.5
Rank #16/35 · confidence 1 · eval date 2025-11-13
Kimi K2.5
4.2
Rank #22/35 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner31.0
Rank #19/47 · confidence 1 · eval date 2025-11-13
Kimi K2.5
27.9
Rank #21/47 · confidence 4 · eval date 2026-02-01
GPT-5.1
49.9
Rank #30/56 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner62.8
Rank #20/56 · confidence 4 · eval date 2026-02-01
GPT-5.1
26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner29.4
Rank #31/96 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner37.6
Rank #31/90 · confidence 1 · eval date 2025-11-13
Kimi K2.5
34.3
Rank #37/90 · confidence 4 · eval date 2026-02-01
GPT-5.1
87.3
Rank #36/96 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner87.9
Rank #33/96 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
Kimi K2.5
35.4
Rank #44/99 · confidence 4 · eval date 2026-02-01
GPT-5.1
51.3
Rank #65/90 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner64.6
Rank #58/90 · confidence 4 · eval date 2026-02-01
GPT-5.1
1217.0
Rank #39/66 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner1279.0
Rank #22/66 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner75.5
Rank #23/57 · confidence 1 · eval date 2025-11-13
Kimi K2.5
75.4
Rank #25/57 · confidence 4 · eval date 2026-02-01
GPT-5.1
winner72.9
Rank #30/86 · confidence 1 · eval date 2025-11-13
Kimi K2.5
70.2
Rank #38/86 · confidence 4 · eval date 2026-02-01
GPT-5.1
81.9
Rank #52/84 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner95.9
Rank #11/84 · confidence 4 · eval date 2026-02-01
GPT-5.1
41.2
Rank #35/50 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner45.9
Rank #30/50 · confidence 4 · eval date 2026-02-01
GPT-5.1
21.0
Rank #36/54 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner21.7
Rank #32/54 · confidence 4 · eval date 2026-02-01
GPT-5.1
24.4
Rank #35/50 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner25.4
Rank #34/50 · confidence 4 · eval date 2026-02-01
GPT-5.1
987.0
Rank #35/54 · confidence 1 · eval date 2025-11-13
Kimi K2.5
winner1009.0
Rank #34/54 · confidence 4 · eval date 2026-02-01
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | Kimi K2.5 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.1 | Kimi K2.5 |
|---|---|---|
25 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Kimi K2.5 speed / latency 38 tok/s / 22910ms input / output No data |
10 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Kimi K2.5 speed / latency 65 tok/s / 9952ms input / output No data |
7 tests | GPT-5.1 speed / latency 139 tok/s / 1654ms input / output No data | Kimi K2.5 speed / latency 44 tok/s / 883ms input / output No data |
5 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Kimi K2.5 speed / latency 39 tok/s / 26203ms input / output No data |
5 tests | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data | Kimi K2.5 speed / latency N/A / N/A input / output No data |
GPT-5.1 gpt-5.1-all speed / latency No data input / output $0/request | Kimi K2.5 kimi-k2.5 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.1. 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 inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
