Model comparison
GPT-5.4 mini vs o3-mini
Head-to-head evidence from 6 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.4 mini #75 (Estimated); o3-mini #136 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.4 mini and o3-mini share 6 comparable benchmark results. 1 of 8 categories are comparable. 24 results are unique to GPT-5.4 mini; 4 to o3-mini.
Updated July 23, 2026- Shared results
- 6
- GPT-5.4 mini only
- 24
- o3-mini only
- 4
- Comparable categories
- 1 / 8
Pick GPT-5.4 mini if you want the stronger benchmark profile. o3-mini 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 6 shared benchmark results across 3 evidence categories; 1 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 mini is clearly ahead on the BenchAlign aggregate, 56.77 to 47.41. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 mini is also the more expensive model on tokens at $0.75 input / $4.50 output per 1M tokens, versus $1.10 input / $4.40 output per 1M tokens for o3-mini. GPT-5.4 mini gives you the larger context window at 400K, compared with 200K for o3-mini.
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 mini | Δ | o3-mini |
|---|---|---|---|
| Knowledge | GPT-5.4 mini47.8 | Margin→ 29.4 | o3-mini77.2 |
| Agentic | GPT-5.4 mini65.7 | MarginNo overlap | o3-miniNot measured |
| Coding | GPT-5.4 miniNot measured | MarginNo overlap | o3-mini49.3 |
| Math | GPT-5.4 mini21.7 | MarginNo overlap | o3-miniNot measured |
| Multimodal | GPT-5.4 mini76.6 | MarginNo overlap | o3-miniNot measured |
| Inst. Following | GPT-5.4 miniNot measured | MarginNo overlap | o3-mini93.9 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
GPQA
KnowledgeA 88%B 77.2%Winner: GPT-5.4 miniΔ 10.8GPQA: GPT-5.4 mini scored 88%; o3-mini scored 77.2%. GPT-5.4 mini wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.4 mini | o3-mini | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.4 mini$0.75 input / $4.5 output | o3-mini$1.1 input / $4.4 output | GPT-5.4 mini has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.4 mini201 tok/s | o3-mini160 tok/s | GPT-5.4 mini has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.4 mini3.85 s | o3-mini7.12 s | GPT-5.4 mini reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.4 mini400K | o3-mini200K | GPT-5.4 mini lists the larger context window. |
Benchmark Deep Dive
Agentic9 benchmarks
| Benchmark | GPT-5.4 mini | o3-mini | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 60% | — | Not comparable |
| OSWorld-VerifiedSource | 72.1% | — | Not comparable |
| MCP AtlasSource | 57.7% | — | Not comparable |
| ToolathlonSource | 42.9% | — | Not comparable |
| τ²-bench resultsSource | 83.3% | 28.7% | GPT-5.4 mini leads |
| AA Agentic IndexSource | 30.2% | — | Not comparable |
| APEX-Agents-AASource | 28.2% | — | Not comparable |
| GDPval-AASource | 33.6% | — | Not comparable |
| GDPval-AASource | 1171 | — | Not comparable |
Coding5 benchmarks
Reasoning2 benchmarks
Knowledgeo3-mini wins10 benchmarks
| Benchmark | GPT-5.4 mini | o3-mini | Result |
|---|---|---|---|
| GPQASource | 88% | 77.2% | GPT-5.4 mini leads |
| HLESource | 41.5% | — | Not comparable |
| HLE w/o toolsSource | 28.2% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 40.0% | 19.0% | GPT-5.4 mini leads |
| AA-GPQA DiamondSource | 87.5% | 74.8% | GPT-5.4 mini leads |
| AA-HLESource | 26.6% | 8.7% | GPT-5.4 mini leads |
| AA-Omniscience IndexSource | -18.7% | — | Not comparable |
| AA-Omniscience AccuracySource | 37.5% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 89.8% | — | Not comparable |
| MMLUSource | — | 86.9% | Not comparable |
Math3 benchmarks
Multimodal3 benchmarks
Frequently Asked Questions (2)
Which is better, GPT-5.4 mini or o3-mini?
GPT-5.4 mini is ahead on BenchLM's BenchAlign leaderboard, 56.77 to 47.41. The biggest single separator in this matchup is GPQA, where the scores are 88% and 77.2%.
Which is better for knowledge tasks, GPT-5.4 mini or o3-mini?
o3-mini has the edge for knowledge tasks in this comparison, averaging 77.2 versus 47.8. Inside this category, Artificial Analysis Intelligence Index is the benchmark that creates the most daylight between them.
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