Data points: 84
The readout for GPT-5.3 Codex and Grok 4.5, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 4 to 0.
Evidence depth
84 data points
Includes 14 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 20 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.
Model compare GPT-5.3 Codex vs Grok 4.5gpt-5-3-codex-vs-grok-4-5 | Model A GPT-5.3 Codex | Model B Grok 4.5 |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 4 wins | 0 wins |
| Where it leads | Cheapest input price, Free providers, Provider coverage, Recent tests |
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-5.3 Codex
67.6
Avg. score
Grok 4.5
73.1
Selected category
Agents
Grok 4.5 leads by 11.9
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.3 Codex
winner82.0
Rank #8/96 · confidence 1 · eval date 2026-02-05
Grok 4.5
75.0
Rank #13/96 · confidence 1 · eval date 2026-07-08
GPT-5.3 Codex
winner89.9 tok/s
Rank #55/113 · confidence 4
Grok 4.5
85.1 tok/s
Rank #59/113 · confidence 4
GPT-5.3 Codex
87.44 s
Rank #110/113 · confidence 4
Grok 4.5
winner23.63 s
Rank #81/113 · confidence 4
GPT-5.3 Codex
87.44 s
Rank #112/113 · confidence 4
Grok 4.5
winner23.63 s
Rank #104/113 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #113/138 · confidence 4
Grok 4.5
winner$6.00/M
Rank #93/138 · confidence 4
GPT-5.3 Codex
$4.81/M
Rank #113/138 · confidence 4
Grok 4.5
winner$3.00/M
Rank #98/138 · confidence 4
GPT-5.3 Codex
winner$1.75/M
Rank #104/138 · confidence 4
Grok 4.5
$2.00/M
Rank #107/138 · confidence 4
GPT-5.3 Codex
91.5%
Rank #6/152 · confidence 4
Grok 4.5
winner93.1%
Rank #3/152 · confidence 4
GPT-5.3 Codex
39.9%
Rank #8/150 · confidence 4
Grok 4.5
winner40.3%
Rank #6/150 · confidence 4
GPT-5.3 Codex
56.8
Rank #12/25 · confidence 1 · eval date 2026-02-05
Grok 4.5
winner64.7
Rank #3/25 · confidence 1 · eval date 2026-07-08
GPT-5.3 Codex
53.2%
Rank #7/149 · confidence 4
Grok 4.5
winner54.1%
Rank #5/149 · confidence 4
GPT-5.3 Codex
winner83.6
Rank #7/83 · confidence 1 · eval date 2026-02-05
Grok 4.5
79.5
Rank #15/83 · confidence 1 · eval date 2026-07-08
GPT-5.3 Codex
77.3
Rank #4/33 · confidence 1 · eval date 2026-02-05
Grok 4.5
winner83.3
Rank #2/33 · confidence 1 · eval date 2026-07-08
GPT-5.3 Codex
78.4
Rank #14/81 · confidence 1 · eval date 2026-02-05
Grok 4.5
winner84.7
Rank #6/81 · confidence 1 · eval date 2026-07-08
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | Grok 4.5 |
|---|---|---|
| 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-5.3 Codex | Grok 4.5 |
|---|---|---|
10 tests | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
This report only uses LMSpeed data for GPT-5.3 Codex and Grok 4.5: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.3 Codex | Grok 4.5 |
|---|---|---|
| When to choose each model | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Free providers, Provider coverage, Recent tests. | Grok 4.5 Grok 4.5 does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. |
TL;DR: GPT-5.3 Codex leads across 84 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.3 Codex vs Grok 4.5 into nearby model comparisons with enough verified LMSpeed data.
| No data |
| Model metadata | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. | Grok 4.5 exposes 500K tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | xAI |
| Context window | 400K tokens | 500K tokens |
| Max output | 128K tokens | No data |
| Released | Feb 2026 | No data |
| Modalities | Input TextImageFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON mode |
| Parameters | No data | No data |
| Tokenizer | GPT | Grok |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.3-codex | x-ai/grok-4.5 |
| References | No data | No data |
Grok 4.5
speed / latency
N/A / N/A
input / output
No data
AI派0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
|---|
Future Hub0 tests | GPT-5.3 Codex gpt-5.3-codex speed / latency N/A / N/A input / output $3.50/M / $28.00/M | Grok 4.5 grok-4.5 speed / latency N/A / N/A input / output $75.00/M / $75.00/M |
|---|
OpenRouter0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
|---|
ZenMux0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | Grok 4.5 speed / latency N/A / N/A input / output No data |
|---|
GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $3.75/M / $30.00/M | Grok 4.5 grok-4.5 speed / latency No data input / output $75.00/M / $75.00/M |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
