Data points: 94
Model compare
GPT-5.5 vs O3 Mini
The readout for GPT-5.5 and O3 Mini, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.5
GPT-5.5 has the higher weighted result; Model A / B score 69.3 to 30.7.
Evidence depth
94 data points
Includes 14 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.5
The charts below split 24 high-signal samples across speed, scores, and audit health.
Change comparison
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
Comparison sheet
This report only uses LMSpeed data for GPT-5.5 and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.5 | O3 Mini |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 69.3 pts | 30.7 pts |
| Benchmark category leads | 4 categories | 2 categories |
| Operational advantages | Cheapest input price, First-token latency, Free providers, Provider coverage | Average speed |
| Context window | 1.1M tokens | 200K tokens |
| Max output | 128K tokens | 100K tokens |
| Modalities | Input FileImageText Output Text | Input TextFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
Model metadata
Model metadata
| Model compare | GPT-5.5 | O3 Mini |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Apr 2026 | Feb 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2025-12-01 | 2023-10-31 |
| OpenRouter ID | openai/gpt-5.5 | openai/o3-mini |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-5.5 and O3 Mini: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.5
GPT-5.5 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge) and operational dimensions (Cheapest input price, First-token latency, Free providers, Provider coverage).
O3 Mini
O3 Mini is stronger in benchmark categories (Math, Instruction following) and operational dimensions (Average speed).
Benchmark score comparison
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Category performance
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
- Model A coverage
- 7 / 8
- Model B coverage
- 6 / 8
- Shared
- 6 shared categories
Avg. score
GPT-5.5
57.7
Avg. score
O3 Mini
48.3
Agents
GPT-5.5 leads by 21.5
Coding
GPT-5.5 leads by 20.1
Reasoning
GPT-5.5 leads by 9.5
Knowledge
GPT-5.5 leads by 10.7
Math
O3 Mini leads by 2.3
Multilingual
No data
Multimodal
GPT-5.5
Instruction following
O3 Mini leads by 0.8
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.5
winner69.0
Rank #20/111 · confidence 4 · eval date 2026-04-23
O3 Mini
51.0
Rank #78/111 · confidence 1 · eval date 2025-01-31
GPT-5.5
$5.00/M
Rank #168/186 · confidence 4
O3 Mini
winner$1.10/M
Rank #117/186 · confidence 4
GPT-5.5
$11.25/M
Rank #174/186 · confidence 4
O3 Mini
winner$1.93/M
Rank #118/186 · confidence 4
GPT-5.5
$30.00/M
Rank #174/186 · confidence 4
O3 Mini
winner$4.40/M
Rank #119/186 · confidence 4
GPT-5.5
winner93.5%
Rank #7/218 · confidence 4
O3 Mini
74.8%
Rank #122/218 · confidence 4
GPT-5.5
winner45.8%
Rank #15/216 · confidence 4
O3 Mini
7.9%
Rank #135/216 · confidence 4
GPT-5.5
winner55.8
Rank #16/113 · confidence 4 · eval date 2026-04-23
O3 Mini
39.9
Rank #76/113 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner51.9
Rank #51/87 · confidence 4 · eval date 2026-04-23
O3 Mini
21.3
Rank #86/87 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner93.5
Rank #8/113 · confidence 4 · eval date 2026-04-23
O3 Mini
74.8
Rank #87/113 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner45.8
Rank #13/114 · confidence 4 · eval date 2026-04-23
O3 Mini
7.9
Rank #89/114 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner78.8
Rank #22/83 · confidence 4 · eval date 2026-04-23
O3 Mini
65.6
Rank #48/83 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner38.6
Rank #30/117 · confidence 4 · eval date 2026-04-23
O3 Mini
19.2
Rank #88/117 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner93.2
Rank #5/52 · confidence 4 · eval date 2026-04-23
O3 Mini
91.0
Rank #14/52 · confidence 1 · eval date 2025-01-31
GPT-5.5
winner98.0
Rank #8/82 · confidence 4 · eval date 2026-04-23
O3 Mini
28.7
Rank #72/82 · confidence 1 · eval date 2025-01-31
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.5 | O3 Mini |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.5 | O3 Mini |
|---|---|---|
丸美小沐25 tests | GPT-5.5 speed / latency N/A / N/A input / output No data | O3 Mini speed / latency 66 tok/s / 6491ms input / output No data |
9527 API10 tests | GPT-5.5 speed / latency 52 tok/s / 2732ms input / output No data | O3 Mini speed / latency N/A / N/A input / output No data |
DeepKey API10 tests | GPT-5.5 speed / latency 43 tok/s / 2874ms input / output No data | O3 Mini speed / latency N/A / N/A input / output No data |
ZetaTechs API6 tests | GPT-5.5 speed / latency N/A / N/A input / output No data | O3 Mini speed / latency 44 tok/s / 17418ms input / output No data |
N1N5 tests | GPT-5.5 speed / latency N/A / N/A input / output No data | O3 Mini speed / latency 117 tok/s / 4809ms input / output No data |
GPT-5.5 gpt-5.5-high speed / latency No data input / output $0/request | O3 Mini o3-mini-medium speed / latency No data input / output $0/request | |
GPT-5.5 gpt-5.5-2026-04-23 speed / latency No data input / output $0.685/M/$4.11/M | O3 Mini o3-mini-all speed / latency No data input / output $0.0033/request | |
GPT-5.5 gpt-5.5 speed / latency No data input / output $0.685/M/$5.48/M | O3 Mini o3-mini-all speed / latency No data input / output $0.0033/request | |
GPT-5.5 gpt-5.5 speed / latency No data input / output $6.16/M/$36.99/M | O3 Mini o3-mini-all speed / latency No data input / output $0.0062/request | |
GPT-5.5 gpt-5.5-openai-compact speed / latency No data input / output $1.03/M/$6.16/M | O3 Mini o3-mini-all speed / latency No data input / output $0.0095/request |
FAQ
Weighted outcome: GPT-5.5. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
- Why is this comparison indexable?
- It has 6 verifiable comparison points, and both models have pricing or benchmark data.
- Are missing metrics invented?
- No. Metrics without LMSpeed data are omitted from this report.