Model comparison
Claude 3.5 Sonnet vs GPT-5.4 Pro
Head-to-head evidence from 2 shared benchmark results across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 3.5 Sonnet #132 (Estimated); GPT-5.4 Pro #44 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 3.5 Sonnet and GPT-5.4 Pro share 2 comparable benchmark results. 2 of 8 categories are comparable. 2 results are unique to Claude 3.5 Sonnet; 10 to GPT-5.4 Pro.
Updated July 23, 2026- Shared results
- 2
- Claude 3.5 Sonnet only
- 2
- GPT-5.4 Pro only
- 10
- Comparable categories
- 2 / 8
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Claude 3.5 Sonnet only becomes the better choice if knowledge is the priority or you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 1 evidence category; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.4 Pro is clearly ahead on the BenchAlign aggregate, 60.89 to 47.74. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in mathematics, where it averages 46.9 against 1.6. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 2.069% to 50.000%. Claude 3.5 Sonnet does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $3.00 input / $15.00 output per 1M tokens for Claude 3.5 Sonnet. That is roughly 12.0x on output cost alone. GPT-5.4 Pro is the reasoning model in the pair, while Claude 3.5 Sonnet is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 200K for Claude 3.5 Sonnet.
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 | Claude 3.5 Sonnet | Δ | GPT-5.4 Pro |
|---|---|---|---|
| Math | Claude 3.5 Sonnet1.6 | Margin→ 45.3 | GPT-5.4 Pro46.9 |
| Knowledge | Claude 3.5 Sonnet59.4 | Margin← 0.7 | GPT-5.4 Pro58.7 |
| Agentic | Claude 3.5 SonnetNot measured | MarginNo overlap | GPT-5.4 Pro89.3 |
| Coding | Claude 3.5 Sonnet49.0 | MarginNo overlap | GPT-5.4 ProNot measured |
| Reasoning | Claude 3.5 SonnetNot measured | MarginNo overlap | GPT-5.4 Pro83.3 |
| Multimodal | Claude 3.5 SonnetNot measured | MarginNo overlap | GPT-5.4 Pro94.0 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 2.069%B 50.000%Winner: GPT-5.4 ProΔ 47.9FrontierMath v2 (Tiers 1-3): Claude 3.5 Sonnet scored 2.069%; GPT-5.4 Pro scored 50.000%. GPT-5.4 Pro wins this benchmark. - Source ↗
FrontierMath v2 (Tier 4)
MathA 0.000%B 37.500%Winner: GPT-5.4 ProΔ 37.5FrontierMath v2 (Tier 4): Claude 3.5 Sonnet scored 0.000%; GPT-5.4 Pro scored 37.500%. GPT-5.4 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 3.5 Sonnet | GPT-5.4 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 3.5 Sonnet$3 input / $15 output | GPT-5.4 Pro$30 input / $180 output | Claude 3.5 Sonnet has the lower combined listed price. |
| Generation speedtokens per second | Claude 3.5 SonnetNot available | GPT-5.4 Pro74 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 3.5 SonnetNot available | GPT-5.4 Pro151.79 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 3.5 Sonnet200K | GPT-5.4 Pro1.05M | GPT-5.4 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | Claude 3.5 Sonnet | GPT-5.4 Pro | Result |
|---|---|---|---|
| BrowseCompSource | — | 89.3% | Not comparable |
Coding1 benchmarks
| Benchmark | Claude 3.5 Sonnet | GPT-5.4 Pro | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 49% | — | Not comparable |
Reasoning2 benchmarks
KnowledgeClaude 3.5 Sonnet wins5 benchmarks
MathGPT-5.4 Pro wins4 benchmarks
Multimodal1 benchmarks
| Benchmark | Claude 3.5 Sonnet | GPT-5.4 Pro | Result |
|---|---|---|---|
| MMMU-ProSource | — | 94% | Not comparable |
Frequently Asked Questions (3)
Which is better, Claude 3.5 Sonnet or GPT-5.4 Pro?
GPT-5.4 Pro is ahead on BenchLM's BenchAlign leaderboard, 60.89 to 47.74. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 2.069% and 50.000%.
Which is better for knowledge tasks, Claude 3.5 Sonnet or GPT-5.4 Pro?
Claude 3.5 Sonnet has the edge for knowledge tasks in this comparison, averaging 59.4 versus 58.7. GPT-5.4 Pro stays close enough that the answer can still flip depending on your workload.
Which is better for math, Claude 3.5 Sonnet or GPT-5.4 Pro?
GPT-5.4 Pro has the edge for math in this comparison, averaging 46.9 versus 1.6. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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