Data points: 102
Model compare
The readout for GPT-5.2 and Grok 4.20, before the detailed comparison sheet.
Weighted outcome: GPT-5.2. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.2
GPT-5.2 has the higher weighted result; Model A / B score 96 to 4.
Evidence depth
102 data points
Includes 19 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.2
The charts below split 27 high-signal samples across speed, scores, and audit health.
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.
This report only uses LMSpeed data for GPT-5.2 and Grok 4.20: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.2 | Grok 4.20 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 96.0 pts | 4.0 pts |
| Benchmark category leads | 5 categories | 0 categories |
| Operational advantages | Cheapest input price, First-token latency, Free providers, Provider coverage | Average speed |
| Context window | 400K tokens | 2M tokens |
| Max output | 128K tokens | No data |
| Modalities | Input FileImageText Output Text |
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 compare | GPT-5.2 | Grok 4.20 |
|---|---|---|
| Developer | OpenAI | xAI |
| Released | Dec 2025 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | Grok |
| Knowledge cutoff | No data | 2025-09-01 |
| OpenRouter ID | openai/gpt-5.2 | x-ai/grok-4.20 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.2 and Grok 4.20: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.2
GPT-5.2 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Multimodal) and operational dimensions (Cheapest input price, First-token latency, Free providers, Provider coverage).
Grok 4.20
Grok 4.20 has these operational advantages: Average speed.
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-5.2
52.8
Avg. score
Grok 4.20
45.1
GPT-5.2 leads by 4.8
GPT-5.2 leads by 9.1
GPT-5.2 leads by 2.5
GPT-5.2 leads by 12.7
GPT-5.2
No data
GPT-5.2 leads by 4.5
GPT-5.2
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.2
winner53.0
Rank #50/84 · confidence 3 · eval date 2025-12-11
Grok 4.20
46.0
Rank #65/84 · confidence 2 · eval date 2026-03-10
GPT-5.2
$14.00/M
Rank #133/162 · confidence 4
Grok 4.20
winner$6.00/M
Rank #105/162 · confidence 4
GPT-5.2
$4.81/M
Rank #132/162 · confidence 4
Grok 4.20
winner$3.00/M
Rank #112/162 · confidence 4
GPT-5.2
winner$1.75/M
Rank #120/162 · confidence 4
Grok 4.20
$2.00/M
Rank #123/162 · confidence 4
GPT-5.2
52.9
Rank #12/15 · confidence 3 · eval date 2025-12-11
Grok 4.20
winner53.3
Rank #11/15 · confidence 2 · eval date 2026-03-10
GPT-5.2
71.2%
Rank #110/188 · confidence 4
Grok 4.20
winner91.1%
Rank #14/188 · confidence 4
GPT-5.2
61.4
Rank #22/25 · confidence 3 · eval date 2025-12-11
Grok 4.20
winner61.7
Rank #21/25 · confidence 2 · eval date 2026-03-10
GPT-5.2
7.3%
Rank #109/187 · confidence 4
Grok 4.20
winner32.2%
Rank #29/187 · confidence 4
GPT-5.2
winner53.5
Rank #6/33 · confidence 3 · eval date 2025-12-11
Grok 4.20
4.1
Rank #30/33 · confidence 2 · eval date 2026-03-10
GPT-5.2
winner80.0
Rank #12/43 · confidence 3 · eval date 2025-12-11
Grok 4.20
76.7
Rank #23/43 · confidence 2 · eval date 2026-03-10
GPT-5.2
winner55.6
Rank #25/37 · confidence 3 · eval date 2025-12-11
Grok 4.20
51.8
Rank #32/37 · confidence 2 · eval date 2026-03-10
GPT-5.2
winner52.2
Rank #34/65 · confidence 3 · eval date 2025-12-11
Grok 4.20
44.1
Rank #49/65 · confidence 2 · eval date 2026-03-10
GPT-5.2
40.4%
Rank #64/185 · confidence 4
Grok 4.20
winner45.6%
Rank #34/185 · confidence 4
GPT-5.2
winner82.1
Rank #8/22 · confidence 3 · eval date 2025-12-11
Grok 4.20
60.9
Rank #21/22 · confidence 2 · eval date 2026-03-10
GPT-5.2
winner79.5
Rank #10/27 · confidence 3 · eval date 2025-12-11
Grok 4.20
75.2
Rank #24/27 · confidence 2 · eval date 2026-03-10
GPT-5.2
winner70.3
Rank #11/35 · confidence 3 · eval date 2025-12-11
Grok 4.20
35.9
Rank #32/35 · confidence 2 · eval date 2026-03-10
GPT-5.2
1219.0
Rank #35/66 · confidence 3 · eval date 2025-12-11
Grok 4.20
winner1252.0
Rank #30/66 · confidence 2 · eval date 2026-03-10
GPT-5.2
winner46.5
Rank #29/50 · confidence 3 · eval date 2025-12-11
Grok 4.20
38.4
Rank #42/50 · confidence 2 · eval date 2026-03-10
GPT-5.2
22.0
Rank #48/53 · confidence 3 · eval date 2025-12-11
Grok 4.20
winner30.2
Rank #44/53 · confidence 2 · eval date 2026-03-10
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.2 | Grok 4.20 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.2 | Grok 4.20 |
|---|---|---|
45 tests | GPT-5.2 speed / latency 52 tok/s / 2671ms input / output No data | Grok 4.20 speed / latency 67 tok/s / 1296ms input / output No data |
20 tests | GPT-5.2 speed / latency 64 tok/s / 3553ms input / output No data | Grok 4.20 speed / latency 103 tok/s / 9875ms input / output No data |
10 tests | GPT-5.2 speed / latency N/A / N/A input / output No data | Grok 4.20 speed / latency 82 tok/s / 10813ms input / output No data |
10 tests | GPT-5.2 speed / latency 57 tok/s / 1904ms input / output No data | Grok 4.20 speed / latency 41 tok/s / 1129ms input / output No data |
10 tests | GPT-5.2 speed / latency 71 tok/s / 2893ms input / output No data | Grok 4.20 speed / latency 55 tok/s / 1168ms input / output No data |
GPT-5.2 gpt-5.2 speed / latency No data input / output $0.024/M/$0.192/M | Grok 4.20 grok-4.20-fast speed / latency No data input / output $0/M | |
GPT-5.2 gpt-5.2 speed / latency No data input / output $0/M/$0/M | Grok 4.20 grok-4.20-fast speed / latency No data input / output $0/M | |
GPT-5.2 gpt-5-2 speed / latency No data input / output $0/request | Grok 4.20 grok-4.20-0309 speed / latency No data input / output $0.100/request |
Weighted outcome: GPT-5.2. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
