Model comparison
GPT-5.4 Pro vs Grok 4.3
Head-to-head evidence from 3 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.4 Pro #44 (Estimated); Grok 4.3 #31 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.4 Pro and Grok 4.3 share 3 comparable benchmark results. 2 of 8 categories are comparable. 9 results are unique to GPT-5.4 Pro; 22 to Grok 4.3.
Updated July 23, 2026- Shared results
- 3
- GPT-5.4 Pro only
- 9
- Grok 4.3 only
- 22
- Comparable categories
- 2 / 8
Pick Grok 4.3 if you want the stronger benchmark profile. GPT-5.4 Pro only becomes the better choice if knowledge is the priority or you need the larger 1.05M context window.
Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 3 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Grok 4.3 is clearly ahead on the BenchAlign aggregate, 65.1 to 60.89. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $1.25 input / $2.50 output per 1M tokens for Grok 4.3. That is roughly 72.0x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 1M for Grok 4.3.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-5.4 Pro | Δ | Grok 4.3 |
|---|---|---|---|
| Knowledge | GPT-5.4 Pro58.7 | Margin← 16.3 | Grok 4.342.4 |
| Multimodal | GPT-5.4 Pro94.0 | Margin← 15.9 | Grok 4.378.1 |
| Agentic | GPT-5.4 Pro89.3 | MarginNo overlap | Grok 4.3Not measured |
| Coding | GPT-5.4 ProNot measured | MarginNo overlap | Grok 4.347.3 |
| Reasoning | GPT-5.4 Pro83.3 | MarginNo overlap | Grok 4.3Not measured |
| Math | GPT-5.4 Pro46.9 | MarginNo overlap | Grok 4.3Not measured |
| Inst. Following | GPT-5.4 ProNot measured | MarginNo overlap | Grok 4.381.3 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.4 Pro | Grok 4.3 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.4 Pro$30 input / $180 output | Grok 4.3$1.25 input / $2.5 output | Grok 4.3 has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.4 Pro74 tok/s | Grok 4.3209 tok/s | Grok 4.3 has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.4 Pro151.79 s | Grok 4.312.36 s | Grok 4.3 reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.4 Pro1.05M | Grok 4.31M | GPT-5.4 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic8 benchmarks
| Benchmark | GPT-5.4 Pro | Grok 4.3 | Result |
|---|---|---|---|
| BrowseCompSource | 89.3% | — | Not comparable |
| τ²-bench resultsSource | — | 97.7% | Not comparable |
| GDPval-AASource | — | 29.2% | Not comparable |
| AA Agentic IndexSource | — | 24.1% | Not comparable |
| APEX-Agents-AASource | — | 17.0% | Not comparable |
| GDPval-AASource | — | 1085 | Not comparable |
| Gert LabsSource | — | 43.86% | Not comparable |
| ResearchClawBenchSource | — | 12.4% | Not comparable |
Coding3 benchmarks
Reasoning3 benchmarks
KnowledgeGPT-5.4 Pro wins11 benchmarks
| Benchmark | GPT-5.4 Pro | Grok 4.3 | Result |
|---|---|---|---|
| HLESource | 58.7% | 35% | GPT-5.4 Pro leads |
| FrontierScienceSource | 36.7% | — | Not comparable |
| FrontierScience ResearchSource | 36.7% | — | Not comparable |
| HLE w/o toolsSource | 42.7% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 37.6% | Not comparable |
| GPQASource | — | 90.1% | Not comparable |
| AA-Omniscience AccuracySource | — | 34.6% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 25.0% | Not comparable |
| AA-GPQA DiamondSource | — | 90.1% | Not comparable |
| AA-HLESource | — | 35.0% | Not comparable |
| AA-Omniscience IndexSource | — | 18.3% | Not comparable |
Math4 benchmarks
MultimodalGPT-5.4 Pro wins3 benchmarks
Frequently Asked Questions (3)
Which is better, GPT-5.4 Pro or Grok 4.3?
Grok 4.3 is ahead on BenchLM's BenchAlign leaderboard, 65.1 to 60.89. The biggest single separator in this matchup is HLE, where the scores are 58.7% and 35%.
Which is better for knowledge tasks, GPT-5.4 Pro or Grok 4.3?
GPT-5.4 Pro has the edge for knowledge tasks in this comparison, averaging 58.7 versus 42.4. Inside this category, HLE is the benchmark that creates the most daylight between them.
Which is better for multimodal and grounded tasks, GPT-5.4 Pro or Grok 4.3?
GPT-5.4 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 94 versus 78.1. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
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