Data points: 67
Model compare
The readout for GPT-OSS and Kimi K2.5, before the detailed comparison sheet.
Weighted outcome: GPT-OSS. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-OSS
GPT-OSS has the higher weighted result; Model A / B score 80 to 20.
Evidence depth
67 data points
Includes 0 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-OSS
The charts below split 8 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-OSS and Kimi K2.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-OSS | Kimi K2.5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 80.0 pts | 20.0 pts |
| Benchmark category leads | 0 categories | 0 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers | Provider coverage |
| Context window | 131.1K tokens | 262.1K tokens |
| Max output | 131.1K tokens | 262.1K tokens |
| Modalities | Input Text Output Text | Input 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-OSS | Kimi K2.5 |
|---|---|---|
| Developer | No data | MoonshotAI |
| Released | Aug 2025 | Jan 2026 |
| Parameters | 120B | No data |
| Tokenizer | GPT | Other |
| Knowledge cutoff | 2024-06-30 | No data |
| OpenRouter ID | openai/gpt-oss-120b:free | moonshotai/kimi-k2.5 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-OSS and Kimi K2.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-OSS
GPT-OSS has these operational advantages: Cheapest input price, Average speed, First-token latency, Free providers.
Kimi K2.5
Kimi K2.5 has these operational advantages: 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-OSS
-
Avg. score
Kimi K2.5
49.7
Kimi K2.5
Kimi K2.5
Kimi K2.5
Kimi K2.5
Kimi K2.5
Kimi K2.5
Kimi K2.5
Kimi K2.5
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
No shared professional benchmark scores are available yet.
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-OSS | 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-OSS | Kimi K2.5 |
|---|---|---|
130 tests | GPT-OSS speed / latency 153 tok/s / 1011ms input / output No data | Kimi K2.5 speed / latency 48 tok/s / 18528ms input / output No data |
45 tests | GPT-OSS speed / latency 164 tok/s / 1247ms input / output No data | Kimi K2.5 speed / latency 38 tok/s / 22910ms input / output No data |
40 tests | GPT-OSS speed / latency 41 tok/s / 2851ms input / output No data | Kimi K2.5 speed / latency N/A / N/A input / output No data |
40 tests | GPT-OSS speed / latency 1061 tok/s / 857ms input / output No data | Kimi K2.5 speed / latency 14 tok/s / 32712ms input / output No data |
35 tests | GPT-OSS speed / latency 347 tok/s / 2670ms input / output No data | Kimi K2.5 speed / latency N/A / N/A input / output No data |
GPT-OSS gpt-oss-120b speed / latency No data input / output $0/M/$0/M | Kimi K2.5 kimi-k2.5 speed / latency No data input / output $0.031/M | |
GPT-OSS gpt-oss-20b speed / latency No data input / output $0/M/$0/M | Kimi K2.5 kimi-k2.5 speed / latency No data input / output $0.041/M | |
GPT-OSS gpt-oss-20b 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-OSS. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputText outputTool callingReasoning | Text inputImage inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
