Data points: 79
The readout for GPT-5.4 and Grok 4.20, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 3 to 3.
Evidence depth
79 data points
Includes 8 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Tie
The charts below split 15 high-signal samples across speed, scores, and audit health.
Model compare GPT-5.4 vs Grok 4.20gpt-5-4-vs-grok-4-20 | Model A GPT-5.4 | Model B Grok 4.20 |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 3 wins | 3 wins |
| Where it leads | First-token latency, Provider coverage, Recent tests | Cheapest input price, Average speed, Free providers |
| Model metadata | GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output. | Grok 4.20 exposes 2M tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | OpenAI | No data |
| Context window | 1.1M tokens | 2M tokens |
| Max output | 128K tokens | No data |
| Released | Mar 2026 | Mar 2026 |
| Modalities | Input TextImageFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | GPT | Grok |
| Knowledge cutoff | No data | 2025-09-01 |
| OpenRouter ID | openai/gpt-5.4 | x-ai/grok-4.20 |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | GPT-5.4 | Grok 4.20 |
|---|---|---|
| GPQA | 92.0%#3 | 91.1%#6 |
| SciCode | 56.6%#3 | 45.6%#21 |
| HLE | 41.6%#4 | 32.2%#12 |
| Output speed | 92.4 tok/s#56 | 178.5 tok/s#16 |
| Input price | $2.50/M#37 | $2.00/M#36 |
| Output price | $15.00/M#44 | $6.00/M#38 |
| Blended price | $5.63/M#63 | $3.00/M#56 |
| Time to first answer token | 134.24 s#111 | 13.54 s#64 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.4 | Grok 4.20 |
|---|---|---|
| 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 | Grok 4.20 |
|---|---|---|
天宫造物50 tests | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data | Grok 4.20 speed / latency N/A / N/A input / output No data |
星见雅 API50 tests | GPT-5.4 speed / latency 49 tok/s / 5435ms input / output No data | Grok 4.20 speed / latency 67 tok/s / 1296ms input / output No data |
6345ywz API25 tests | GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data | Grok 4.20 speed / latency 82 tok/s / 10813ms input / output No data |
BUZZ15 tests | GPT-5.4 speed / latency N/A / N/A input / output No data | Grok 4.20 speed / latency 103 tok/s / 9875ms input / output No data |
GGBand API10 tests | GPT-5.4 speed / latency 61 tok/s / 3483ms input / output No data | Grok 4.20 speed / latency N/A / N/A input / output No data |
GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $75.00/M / $450.00/M | Grok 4.20 grok-4.20-beta speed / latency No data input / output $0/M / $0/M | |
GPT-5.4 gpt-5.4-low speed / latency No data input / output $18.25/M / $109.50/M | Grok 4.20 grok-4.20-fast speed / latency No data input / output $0/M / $0/M |
This report only uses LMSpeed data for GPT-5.4 and Grok 4.20: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.4 | Grok 4.20 |
|---|---|---|
| When to choose each model | GPT-5.4 GPT-5.4 is stronger when you prioritize First-token latency, Provider coverage, Recent tests. | Grok 4.20 Grok 4.20 is stronger when you prioritize Cheapest input price, Average speed, Free providers. |
TL;DR: Tie leads across 79 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.4 vs Grok 4.20 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.
