Data points: 81
Model compare
The readout for GPT-5.1 and Kimi K2 Thinking, before the detailed comparison sheet.
Weighted outcome: Kimi K2 Thinking. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
Kimi K2 Thinking
Kimi K2 Thinking has the higher weighted result; Model A / B score 46.7 to 53.3.
Evidence depth
81 data points
Includes 8 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Start with Kimi K2 Thinking
The charts below split 15 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 Thinking: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.1 | Kimi K2 Thinking |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 46.7 pts | 53.3 pts |
| Benchmark category leads | 1 categories | 2 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 262.1K tokens |
| Max output | 128K tokens | 100.4K 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 Thinking |
|---|---|---|
| Developer | OpenAI | MoonshotAI |
| Released | Nov 2025 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | Other |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.1 | moonshotai/kimi-k2-thinking |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.1 and Kimi K2 Thinking: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Math) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
Kimi K2 Thinking
Kimi K2 Thinking leads these benchmark categories: Coding, Reasoning.
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 Thinking
55.7
GPT-5.1
Kimi K2 Thinking leads by 8.4
Kimi K2 Thinking leads by 3.1
GPT-5.1
GPT-5.1 leads by 0.4
No data
No data
GPT-5.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.1
$10.00/M
Rank #120/162 · confidence 4
Kimi K2 Thinking
winner$2.50/M
Rank #75/162 · confidence 4
GPT-5.1
$3.44/M
Rank #117/162 · confidence 4
Kimi K2 Thinking
winner$1.07/M
Rank #78/162 · confidence 4
GPT-5.1
$1.25/M
Rank #107/162 · confidence 4
Kimi K2 Thinking
winner$0.600/M
Rank #80/162 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
Kimi K2 Thinking
84.8%
Rank #28/125 · confidence 4
GPT-5.1
winner87.3%
Rank #33/188 · confidence 4
Kimi K2 Thinking
83.8%
Rank #55/188 · confidence 4
GPT-5.1
winner26.5%
Rank #40/187 · confidence 4
Kimi K2 Thinking
22.3%
Rank #49/187 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
Kimi K2 Thinking
85.3%
Rank #8/115 · confidence 4
GPT-5.1
winner43.3%
Rank #42/185 · confidence 4
Kimi K2 Thinking
42.4%
Rank #49/185 · confidence 4
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.1 | Kimi K2 Thinking |
|---|---|---|
| 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 Thinking |
|---|---|---|
5 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Kimi K2 Thinking speed / latency 45 tok/s / 7512ms input / output No data |
0 tests | GPT-5.1 speed / latency N/A / N/A input / output No data | Kimi K2 Thinking 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 | Kimi K2 Thinking 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 | Kimi K2 Thinking 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 | Kimi K2 Thinking speed / latency N/A / N/A input / output No data |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0041/request | Kimi K2 Thinking kimi-k2-thinking speed / latency No data input / output $1.64/M | |
GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0068/request | Kimi K2 Thinking kimi-k2-thinking-251104 speed / latency No data input / output $0.548/M |
Weighted outcome: Kimi K2 Thinking. 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 inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
