Data points: 135
Model compare
The readout for GPT-5.4 and Grok 4.3, before the detailed comparison sheet.
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4
GPT-5.4 has the higher weighted result; Model A / B score 86.7 to 13.3.
Evidence depth
135 data points
Includes 36 benchmark rows, 0 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 44 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-5.4 and Grok 4.3: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.4 | Grok 4.3 |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 86.7 pts | 13.3 pts |
| Benchmark category leads | 5 categories | 1 categories |
| Operational advantages | Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage | No data |
| Context window | 1.1M tokens | 1M tokens |
| Max output | 128K tokens | No data |
| Modalities | Input TextImageFile 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-5.4 | Grok 4.3 |
|---|---|---|
| Developer | OpenAI | xAI |
| Released | Mar 2026 | Apr 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | Grok |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.4 | x-ai/grok-4.3 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.4 and Grok 4.3: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Multimodal) and operational dimensions (Cheapest input price, Average speed, First-token latency, Free providers, Provider coverage).
Grok 4.3
Grok 4.3 leads these benchmark categories: Instruction following.
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-5.4
58.4
Avg. score
Grok 4.3
54.2
GPT-5.4 leads by 7.0
GPT-5.4 leads by 7.6
GPT-5.4 leads by 3.0
GPT-5.4 leads by 2.9
GPT-5.4
GPT-5.4
GPT-5.4 leads by 5.9
Grok 4.3 leads by 3.2
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.4
winner86.0
Rank #3/127 · confidence 4 · eval date 2026-03-05
Grok 4.3
63.0
Rank #44/127 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner0.67 s
Rank #22/139 · confidence 4
Grok 4.3
29.90 s
Rank #104/139 · confidence 4
GPT-5.4
winner0.67 s
Rank #30/139 · confidence 4
Grok 4.3
29.90 s
Rank #128/139 · confidence 4
GPT-5.4
96.3 tok/s
Rank #60/139 · confidence 4
Grok 4.3
winner115.5 tok/s
Rank #52/139 · confidence 4
GPT-5.4
$15.00/M
Rank #138/163 · confidence 4
Grok 4.3
winner$2.50/M
Rank #76/163 · confidence 4
GPT-5.4
$5.63/M
Rank #137/163 · confidence 4
Grok 4.3
winner$1.56/M
Rank #95/163 · confidence 4
GPT-5.4
$2.50/M
Rank #133/163 · confidence 4
Grok 4.3
winner$1.25/M
Rank #109/163 · confidence 4
GPT-5.4
winner74.0
Rank #5/89 · confidence 4 · eval date 2026-03-05
Grok 4.3
64.3
Rank #48/89 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner23.4
Rank #7/73 · confidence 4 · eval date 2026-03-05
Grok 4.3
8.0
Rank #27/73 · confidence 1 · eval date 2026-04-30
GPT-5.4
74.8%
Rank #96/187 · confidence 4
Grok 4.3
winner90.1%
Rank #18/187 · confidence 4
GPT-5.4
10.6%
Rank #90/186 · confidence 4
Grok 4.3
winner35.0%
Rank #20/186 · confidence 4
GPT-5.4
winner91.2
Rank #1/100 · confidence 4 · eval date 2026-03-05
Grok 4.3
61.3
Rank #57/100 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner56.6
Rank #3/96 · confidence 4 · eval date 2026-03-05
Grok 4.3
47.3
Rank #30/96 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner57.6
Rank #5/85 · confidence 4 · eval date 2026-03-05
Grok 4.3
37.9
Rank #35/85 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner71.0
Rank #10/58 · confidence 4 · eval date 2026-03-05
Grok 4.3
42.3
Rank #38/58 · confidence 1 · eval date 2026-04-30
GPT-5.4
47.1%
Rank #23/184 · confidence 4
Grok 4.3
winner47.3%
Rank #22/184 · confidence 4
GPT-5.4
winner96.8
Rank #1/92 · confidence 4 · eval date 2026-03-05
Grok 4.3
63.7
Rank #44/92 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner41.6
Rank #7/96 · confidence 4 · eval date 2026-03-05
Grok 4.3
35.0
Rank #22/96 · confidence 1 · eval date 2026-04-30
GPT-5.4
5.7
Rank #18/29 · confidence 4 · eval date 2026-03-05
Grok 4.3
winner18.3
Rank #9/29 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner51.4
Rank #9/99 · confidence 4 · eval date 2026-03-05
Grok 4.3
37.6
Rank #40/99 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner92.0
Rank #10/96 · confidence 4 · eval date 2026-03-05
Grok 4.3
90.1
Rank #19/96 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner50.0
Rank #10/90 · confidence 4 · eval date 2026-03-05
Grok 4.3
34.6
Rank #36/90 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner88.6
Rank #19/90 · confidence 4 · eval date 2026-03-05
Grok 4.3
25.0
Rank #86/90 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner81.2
Rank #5/26 · confidence 4 · eval date 2026-03-05
Grok 4.3
78.1
Rank #16/26 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner78.4
Rank #15/57 · confidence 4 · eval date 2026-03-05
Grok 4.3
78.1
Rank #16/57 · confidence 1 · eval date 2026-04-30
GPT-5.4
60.0
Rank #49/81 · confidence 4 · eval date 2026-03-05
Grok 4.3
winner69.3
Rank #25/81 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner1254.0
Rank #30/65 · confidence 4 · eval date 2026-03-05
Grok 4.3
1232.0
Rank #33/65 · confidence 1 · eval date 2026-04-30
GPT-5.4
73.9
Rank #24/86 · confidence 4 · eval date 2026-03-05
Grok 4.3
winner81.3
Rank #2/86 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner92.6
Rank #2/75 · confidence 4 · eval date 2026-03-05
Grok 4.3
89.0
Rank #6/75 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner33.3
Rank #4/21 · confidence 4 · eval date 2026-03-05
Grok 4.3
17.0
Rank #12/21 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner64.9
Rank #4/50 · confidence 4 · eval date 2026-03-05
Grok 4.3
43.9
Rank #31/50 · confidence 1 · eval date 2026-04-30
GPT-5.4
87.1
Rank #37/84 · confidence 4 · eval date 2026-03-05
Grok 4.3
winner97.7
Rank #7/84 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner41.1
Rank #11/54 · confidence 4 · eval date 2026-03-05
Grok 4.3
24.1
Rank #31/54 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner44.7
Rank #11/50 · confidence 4 · eval date 2026-03-05
Grok 4.3
29.2
Rank #30/50 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner1395.0
Rank #11/54 · confidence 4 · eval date 2026-03-05
Grok 4.3
1085.0
Rank #30/54 · confidence 1 · eval date 2026-04-30
GPT-5.4
winner15.3
Rank #14/19 · confidence 4 · eval date 2026-03-05
Grok 4.3
12.4
Rank #19/19 · confidence 1 · eval date 2026-04-30
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.4 | Grok 4.3 |
|---|---|---|
| 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-5.4 | Grok 4.3 |
|---|---|---|
5 tests | GPT-5.4 speed / latency 70 tok/s / 2961ms input / output No data | Grok 4.3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.4 speed / latency 44 tok/s / 3441ms input / output No data | Grok 4.3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.4 speed / latency N/A / N/A input / output No data | Grok 4.3 speed / latency 49 tok/s / 6488ms input / output No data |
5 tests | GPT-5.4 speed / latency 44 tok/s / 1119ms input / output No data | Grok 4.3 speed / latency N/A / N/A input / output No data |
5 tests | GPT-5.4 speed / latency 60 tok/s / 2482ms input / output No data | Grok 4.3 speed / latency N/A / N/A input / output No data |
GPT-5.4 gpt-5.4 speed / latency No data input / output $0/M/$0/M | Grok 4.3 grok-4.3 speed / latency No data input / output $0.120/M | |
GPT-5.4 gpt-5.4 speed / latency No data input / output $0/M/$0/M | Grok 4.3 grok-4.3-fast speed / latency No data input / output $75.00/M | |
GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $0/request | Grok 4.3 grok-4.3 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.4. 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 |
|---|
