Data points: 81
The readout for GPT-5.4 and Kimi K2 Thinking, before the detailed comparison sheet.
Decision read
GPT-5.4
GPT-5.4 currently has the stronger profile, with verified wins split 5 to 0.
Evidence depth
81 data points
Includes 8 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 16 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.4 vs Kimi K2 Thinkinggpt-5-4-vs-kimi-k2-thinking | Model A GPT-5.4 | Model B Kimi K2 Thinking |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 5 wins | 0 wins |
| Where it leads | Cheapest input price, Average speed, First-token latency, Provider coverage, Recent tests | No data |
| Model metadata | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. | Kimi K2 Thinking exposes 262.1K tokens; notable signals: Text input, Text output, Tool calling, Structured outputs. |
| Developer | OpenAI | Moonshot AI |
| Context window | 1.1M tokens | 262.1K tokens |
| Max output | 128K tokens | 262.1K tokens |
| Released | Mar 2026 | Nov 2025 |
| Modalities | Input TextImageFile Output Text | Input Text Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | GPT | Other |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.4 | moonshotai/kimi-k2-thinking |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GPT-5.4 | Kimi K2 Thinking |
|---|---|---|
| GPQA | 92.0%#3 | 83.8%#39 |
| SciCode | 56.6%#3 | 42.4%#35 |
| HLE | 41.6%#4 | 22.3%#35 |
| Input price | $2.50/M#37 | $0.600/M#23 |
| Output price | $15.00/M#44 | $2.50/M#27 |
| Time to first token | 134.24 s#110 | 0.93 s#33 |
| Output speed | 92.4 tok/s#56 | 128.6 tok/s#38 |
| Blended price | $5.63/M#63 | $1.07/M#40 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.4 | 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-5.4 | Kimi K2 Thinking |
|---|---|---|
天宫造物50 tests | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data | Kimi K2 Thinking speed / latency N/A / N/A input / output No data |
星见雅 API20 tests | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data | Kimi K2 Thinking speed / latency N/A / N/A input / output No data |
6345ywz API15 tests | GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data | Kimi K2 Thinking speed / latency N/A / N/A input / output No data |
Fengsili API10 tests | GPT-5.4 speed / latency 88 tok/s / 6075ms input / output No data | Kimi K2 Thinking speed / latency N/A / N/A input / output No data |
Omini Api10 tests | GPT-5.4 speed / latency 51 tok/s / 1443ms input / output No data | Kimi K2 Thinking speed / latency N/A / N/A input / output No data |
GPT-5.4 gpt-5.4-free speed / latency No data input / output $0/M / $0/M | Kimi K2 Thinking kimi-k2-thinking speed / latency No data input / output $1.12/M / $4.48/M | |
GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $75.00/M / $450.00/M | Kimi K2 Thinking daipai/moonshotai/kimi-k2-thinking speed / latency No data input / output $0.0010/M / $0.0010/M | |
GPT-5.4 gpt-5.4-high speed / latency No data input / output $0.050/M / $0.050/M | Kimi K2 Thinking kimi-k2-thinking speed / latency No data input / output $0.010/M / $0.010/M |
This report only uses LMSpeed data for GPT-5.4 and Kimi K2 Thinking: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.4 | Kimi K2 Thinking |
|---|---|---|
| When to choose each model | GPT-5.4 GPT-5.4 is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Provider coverage, Recent tests. | Kimi K2 Thinking Kimi K2 Thinking does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. |
TL;DR: GPT-5.4 leads across 81 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.4 vs Kimi K2 Thinking into nearby model comparisons with enough verified LMSpeed data.
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
