Model comparison
GPT-5.4 mini vs GPT-5 (medium)
Head-to-head evidence from 12 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.4 mini #75 (Estimated); GPT-5 (medium) #84 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.4 mini and GPT-5 (medium) share 12 comparable benchmark results. 0 of 8 categories are comparable. 18 results are unique to GPT-5.4 mini; 2 to GPT-5 (medium).
Updated July 23, 2026- Shared results
- 12
- GPT-5.4 mini only
- 18
- GPT-5 (medium) only
- 2
- Comparable categories
- 0 / 8
Benchmark data for GPT-5.4 mini and GPT-5 (medium) is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 12 shared benchmark results across 6 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
GPT-5.4 mini has the larger context window at 400K, compared with 128K for GPT-5 (medium).
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 | GPT-5 (medium) |
|---|---|---|---|
| Agentic | GPT-5.4 mini65.7 | MarginNo overlap | GPT-5 (medium)Not measured |
| Knowledge | GPT-5.4 mini47.8 | MarginNo overlap | GPT-5 (medium)Not measured |
| Math | GPT-5.4 mini21.7 | MarginNo overlap | GPT-5 (medium)Not measured |
| Multimodal | GPT-5.4 mini76.6 | MarginNo overlap | GPT-5 (medium)Not measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.4 mini | GPT-5 (medium) | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.4 mini$0.75 input / $4.5 output | GPT-5 (medium)Not available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.4 mini201 tok/s | GPT-5 (medium)83 tok/s | GPT-5.4 mini has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5.4 mini3.85 s | GPT-5 (medium)36.28 s | GPT-5.4 mini reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5.4 mini400K | GPT-5 (medium)128K | GPT-5.4 mini lists the larger context window. |
Benchmark Deep Dive
Agentic9 benchmarks
| Benchmark | GPT-5.4 mini | GPT-5 (medium) | 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% | 86.5% | GPT-5 (medium) 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 |
Coding4 benchmarks
Reasoning2 benchmarks
Knowledge9 benchmarks
| Benchmark | GPT-5.4 mini | GPT-5 (medium) | Result |
|---|---|---|---|
| GPQASource | 88% | — | Not comparable |
| HLESource | 41.5% | — | Not comparable |
| HLE w/o toolsSource | 28.2% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 40.0% | 33.7% | GPT-5.4 mini leads |
| AA-GPQA DiamondSource | 87.5% | 84.2% | GPT-5.4 mini leads |
| AA-HLESource | 26.6% | 23.5% | GPT-5.4 mini leads |
| AA-Omniscience IndexSource | -18.7% | -10.1% | GPT-5 (medium) leads |
| AA-Omniscience AccuracySource | 37.5% | 38.9% | GPT-5 (medium) leads |
| AA-Omniscience Hallucination RateSource | 89.8% | 80.1% | GPT-5 (medium) leads |
Math3 benchmarks
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.4 mini | GPT-5 (medium) | Result |
|---|---|---|---|
| AA-IFBenchSource | 73.3% | 70.6% | GPT-5.4 mini leads |
Frequently Asked Questions (3)
Can I compare GPT-5.4 mini and GPT-5 (medium) on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-5.4 mini and GPT-5 (medium) today?
GPT-5.4 mini: $0.75 input / $4.50 output per 1M tokens GPT-5 (medium): Pricing unavailable Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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