Data points: 133
Model compare
GPT-5.2 vs GPT-5.5
The readout for GPT-5.2 and GPT-5.5, 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 20 to 80.
Evidence depth
133 data points
Includes 34 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.5
The charts below split 44 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-5.2 and GPT-5.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.2 | GPT-5.5 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 20.0 pts | 80.0 pts |
| Benchmark category leads | 0 categories | 7 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input FileImageText Output Text | Input FileImageText Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage 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-5.2 | GPT-5.5 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Dec 2025 | Apr 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2025-12-01 |
| OpenRouter ID | openai/gpt-5.2 | openai/gpt-5.5 |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-5.2 and GPT-5.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.2
GPT-5.2 has these operational advantages: Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage.
GPT-5.5
GPT-5.5 leads these benchmark categories: Agents, Coding, Reasoning, Knowledge, Math.
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
- 7 / 8
- Shared
- 7 shared categories
Avg. score
GPT-5.2
52.4
Avg. score
GPT-5.5
58.3
Agents
GPT-5.5 leads by 14.3
Coding
GPT-5.5 leads by 3.6
Reasoning
GPT-5.5 leads by 5.7
Knowledge
GPT-5.5 leads by 2.9
Math
GPT-5.5 leads by 1.0
Multilingual
No data
Multimodal
GPT-5.5 leads by 13.4
Instruction following
GPT-5.5 leads by 0.2
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-5.2
52.0
Rank #69/100 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner72.0
Rank #16/100 · confidence 3 · eval date 2026-04-23
GPT-5.2
winner$1.75/M
Rank #135/179 · confidence 4
GPT-5.5
$5.00/M
Rank #163/179 · confidence 4
GPT-5.2
winner$4.81/M
Rank #150/179 · confidence 4
GPT-5.5
$11.25/M
Rank #169/179 · confidence 4
GPT-5.2
winner$14.00/M
Rank #151/179 · confidence 4
GPT-5.5
$30.00/M
Rank #169/179 · confidence 4
GPT-5.2
52.9
Rank #13/17 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner85.0
Rank #3/17 · confidence 3 · eval date 2026-04-23
GPT-5.2
71.2%
Rank #132/211 · confidence 4
GPT-5.5
winner93.5%
Rank #5/211 · confidence 4
GPT-5.2
50.8
Rank #25/29 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner85.0
Rank #7/29 · confidence 3 · eval date 2026-04-23
GPT-5.2
11.6
Rank #27/83 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner27.1
Rank #7/83 · confidence 3 · eval date 2026-04-23
GPT-5.2
winner79.3
Rank #8/100 · confidence 3 · eval date 2025-12-11
GPT-5.5
79.0
Rank #10/100 · confidence 3 · eval date 2026-04-23
GPT-5.2
8.0%
Rank #126/208 · confidence 4
GPT-5.5
winner45.8%
Rank #12/208 · confidence 4
GPT-5.2
53.5
Rank #6/33 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner69.8
Rank #2/33 · confidence 3 · eval date 2026-04-23
GPT-5.2
52.1
Rank #25/108 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner56.1
Rank #8/108 · confidence 3 · eval date 2026-04-23
GPT-5.2
40.4%
Rank #79/204 · confidence 4
GPT-5.5
winner56.1%
Rank #9/204 · confidence 4
GPT-5.2
55.6
Rank #32/49 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner58.6
Rank #17/49 · confidence 3 · eval date 2026-04-23
GPT-5.2
winner56.4
Rank #43/81 · confidence 3 · eval date 2025-12-11
GPT-5.5
48.4
Rank #58/81 · confidence 3 · eval date 2026-04-23
GPT-5.2
40.7
Rank #10/47 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner51.7
Rank #4/47 · confidence 3 · eval date 2026-04-23
GPT-5.2
18.8
Rank #11/35 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner35.4
Rank #6/35 · confidence 3 · eval date 2026-04-23
GPT-5.2
58.3
Rank #29/62 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner71.1
Rank #19/62 · confidence 3 · eval date 2026-04-23
GPT-5.2
44.3
Rank #24/101 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner58.0
Rank #4/101 · confidence 3 · eval date 2026-04-23
GPT-5.2
90.3
Rank #27/108 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner93.5
Rank #5/108 · confidence 3 · eval date 2026-04-23
GPT-5.2
37.7
Rank #28/108 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner45.8
Rank #9/108 · confidence 3 · eval date 2026-04-23
GPT-5.2
43.3
Rank #29/111 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner56.3
Rank #9/111 · confidence 3 · eval date 2026-04-23
GPT-5.2
winner81.6
Rank #13/69 · confidence 3 · eval date 2025-12-11
GPT-5.5
79.3
Rank #15/69 · confidence 3 · eval date 2026-04-23
GPT-5.2
81.2
Rank #40/101 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner89.0
Rank #22/101 · confidence 3 · eval date 2026-04-23
GPT-5.2
79.5
Rank #11/31 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner81.2
Rank #7/31 · confidence 3 · eval date 2026-04-23
GPT-5.2
winner68.9
Rank #17/44 · confidence 3 · eval date 2025-12-11
GPT-5.5
68.2
Rank #18/44 · confidence 3 · eval date 2026-04-23
GPT-5.2
1206.0
Rank #44/75 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner1277.0
Rank #27/75 · confidence 3 · eval date 2026-04-23
GPT-5.2
75.4
Rank #19/84 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner75.9
Rank #14/84 · confidence 3 · eval date 2026-04-23
GPT-5.2
46.5
Rank #28/49 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner72.9
Rank #2/49 · confidence 3 · eval date 2026-04-23
GPT-5.2
34.3
Rank #9/23 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner42.7
Rank #5/23 · confidence 3 · eval date 2026-04-23
GPT-5.2
22.1
Rank #64/69 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner85.0
Rank #8/69 · confidence 3 · eval date 2026-04-23
GPT-5.2
65.8
Rank #24/31 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner84.4
Rank #8/31 · confidence 3 · eval date 2026-04-23
GPT-5.2
47.3
Rank #26/27 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner78.7
Rank #8/27 · confidence 3 · eval date 2026-04-23
GPT-5.2
84.8
Rank #46/82 · confidence 3 · eval date 2025-12-11
GPT-5.5
winner98.0
Rank #8/82 · confidence 3 · eval date 2026-04-23
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-5.2 | GPT-5.5 |
|---|---|---|
| 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-5.2 | GPT-5.5 |
|---|---|---|
6345ywz API35 tests | GPT-5.2 speed / latency N/A / N/A input / output No data | GPT-5.5 speed / latency 38 tok/s / 8937ms input / output No data |
N1N15 tests | GPT-5.2 speed / latency 56 tok/s / 1798ms input / output No data | GPT-5.5 speed / latency N/A / N/A input / output No data |
9527 API10 tests | GPT-5.2 speed / latency N/A / N/A input / output No data | GPT-5.5 speed / latency 52 tok/s / 2732ms input / output No data |
CCTQ10 tests | GPT-5.2 speed / latency N/A / N/A input / output No data | GPT-5.5 speed / latency 44 tok/s / 1697ms input / output No data |
DeepKey API10 tests | GPT-5.2 speed / latency N/A / N/A input / output No data | GPT-5.5 speed / latency 43 tok/s / 2874ms input / output No data |
GPT-5.2 gpt-5-2 speed / latency No data input / output $0/M/$0/M | GPT-5.5 gpt-5-5 speed / latency No data input / output $0/M/$0/M | |
GPT-5.2 gpt-5.2-openai-compact speed / latency No data input / output $0/M/$0/M | GPT-5.5 gpt-5.5 speed / latency No data input / output $0/M/$0/M | |
GPT-5.2 gpt-5.2 speed / latency No data input / output $0/request | GPT-5.5 gpt-5.5 speed / latency No data input / output $0/request | |
GPT-5.2 gpt-5-2 speed / latency No data input / output $0/request | GPT-5.5 gpt-5-5 speed / latency No data input / output $0/request | |
GPT-5.2 gpt-5.2 speed / latency No data input / output $0.0027/request | GPT-5.5 gpt-5.5 speed / latency No data input / output $0.171/M/$1.03/M |
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.