Data points: 62
Model compare
The readout for GPT-5.3 Codex and GPT Chat Latest, before the detailed comparison sheet.
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex has the higher weighted result; Model A / B score 100 to 0.
Evidence depth
62 data points
Includes 0 benchmark rows, 0 audit samples, and 5 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 5 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-5.3 Codex and GPT Chat Latest: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-5.3 Codex | GPT Chat Latest |
|---|---|---|
| Overall leader | Leading | Contender |
| Weighted overall score | 100.0 pts | 0.0 pts |
| Benchmark category leads | 0 categories | 0 categories |
| Operational advantages | Cheapest input price, Free providers, Provider coverage | No data |
| Context window | 400K tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Modalities | Input TextImageFile Output Text | Input |
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-5.3 Codex | GPT Chat Latest |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Feb 2026 | May 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | openai/gpt-5.3-codex | openai/gpt-chat-latest |
| References | No data | No data |
This report only uses LMSpeed data for GPT-5.3 Codex and GPT Chat Latest: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-5.3 Codex
GPT-5.3 Codex has these operational advantages: Cheapest input price, Free providers, Provider coverage.
GPT Chat Latest
GPT Chat Latest does not clearly lead in the benchmark or operational dimensions shared by both models.
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
56.5
Avg. score
GPT Chat Latest
-
GPT-5.3 Codex
GPT-5.3 Codex
GPT-5.3 Codex
GPT-5.3 Codex
No data
No data
No data
GPT-5.3 Codex
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
No shared professional benchmark scores are available yet.
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | GPT Chat Latest |
|---|---|---|
| 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 | GPT Chat Latest |
|---|---|---|
0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT Chat Latest speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT Chat Latest speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.3 Codex gpt-5.3-codex speed / latency N/A / N/A input / output $0.0068/request | GPT Chat Latest gpt-chat-latest speed / latency N/A / N/A input / output $2.68/M |
0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT Chat Latest speed / latency N/A / N/A input / output No data |
0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | GPT Chat Latest speed / latency N/A / N/A input / output No data |
Weighted outcome: GPT-5.3 Codex. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON mode |
|---|
