Data points: 110
The readout for Claude Opus 4.6 and GPT-5.3 Codex, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 2 to 4.
Evidence depth
110 data points
Includes 8 benchmark rows, 6 audit samples, and 7 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 21 high-signal samples across speed, scores, and audit health.
Model compare Claude Opus 4.6 vs GPT-5.3 Codexclaude-opus-4-6-vs-gpt-5-3-codex | Model A Claude Opus 4.6 | Model B GPT-5.3 Codex |
|---|---|---|
| Overall leader | Contender | Leading |
| Verified metric wins | 2 wins | 4 wins |
| Where it leads | Free providers, Recent tests | Cheapest input price, Average speed, First-token latency, Provider coverage |
| Model metadata | Claude Opus 4.6 exposes 1M tokens; notable signals: Text input, Image input, File input, Text output. | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. |
| Developer | Anthropic | OpenAI |
| Context window | 1M tokens | 400K tokens |
| Max output | 128K tokens | 128K tokens |
| Released | Apr 2026 | Feb 2026 |
| 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 modeReasoning |
| Parameters | No data | No data |
| Tokenizer | Claude | GPT |
| Knowledge cutoff | No data | No data |
| OpenRouter ID | anthropic/claude-opus-4.6-fast | openai/gpt-5.3-codex |
| References | No data | No data |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
| Metric | Claude Opus 4.6 | GPT-5.3 Codex |
|---|---|---|
| GPQA | 84.0%#38 | 91.5%#4 |
| HLE | 18.6%#43 | 39.9%#5 |
| SciCode | 45.7%#20 | 53.2%#8 |
| Time to first answer token | 1.44 s#34 | 57.06 s#95 |
| Input price | $5.00/M#41 | $1.75/M#35 |
| Output price | $25.00/M#47 | $14.00/M#43 |
| Time to first token | 1.44 s#57 | 57.06 s#103 |
| Blended price | $10.00/M#68 | $4.81/M#62 |
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Claude Opus 4.6 | GPT-5.3 Codex |
|---|---|---|
BUZZWinner: Claude Opus 4.6 | Claude Opus 4.6 claude-opus-4-6 Audit score 97 10010010088 | GPT-5.3 Codex gpt-5.3-codex No audit yet |
VSLLMWinner: Claude Opus 4.6 | Claude Opus 4.6 claude-opus-4-6 Audit score 94 76100100100 | GPT-5.3 Codex gpt-5.3-codex-spark No audit yet |
Yuan APIWinner: Claude Opus 4.6 | Claude Opus 4.6 claude-opus-4-6 Audit score 89 56100100100 | GPT-5.3 Codex gpt-5.3-codex-spark No audit yet |
Leonhard APIWinner: Claude Opus 4.6 | Claude Opus 4.6 claude-opus-4-6 Audit score 82 668478100 | GPT-5.3 Codex gpt-5.3-codex No audit yet |
钠 APIWinner: Claude Opus 4.6 | Claude Opus 4.6 claude-opus-4-6 Audit score 80 668470100 | GPT-5.3 Codex gpt-5.3-codex-spark No audit yet |
Omini ApiWinner: Claude Opus 4.6 | Claude Opus 4.6 claude-opus-4-6 Audit score 78 70728088 | GPT-5.3 Codex gpt-5.3-codex No audit yet |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Claude Opus 4.6 | GPT-5.3 Codex |
|---|---|---|
UoCode30 tests | Claude Opus 4.6 speed / latency 38 tok/s / 2611ms input / output No data | GPT-5.3 Codex speed / latency 56 tok/s / 4621ms input / output No data |
钠 API25 tests | Claude Opus 4.6 speed / latency 42 tok/s / 2282ms input / output No data | GPT-5.3 Codex speed / latency 63 tok/s / 3786ms input / output No data |
Kunkunout API20 tests | Claude Opus 4.6 speed / latency 40 tok/s / 16141ms input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
Rnglg2 API15 tests | Claude Opus 4.6 speed / latency 57 tok/s / 3926ms input / output No data | GPT-5.3 Codex speed / latency N/A / N/A input / output No data |
小水管 API15 tests | Claude Opus 4.6 speed / latency 45 tok/s / 6167ms input / output No data | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
Claude Opus 4.6 claude-opus-4.6 speed / latency No data input / output $0/M / $0/M | GPT-5.3 Codex GPT-5.3-CodeX speed / latency No data input / output $75.00/M / $75.00/M | |
Claude Opus 4.6 claude-opus-4-6-medium speed / latency No data input / output $0.0014/M / $0.0068/M | GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $0.0005/M / $0.0038/M |
This report only uses LMSpeed data for Claude Opus 4.6 and GPT-5.3 Codex: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | Claude Opus 4.6 | GPT-5.3 Codex |
|---|---|---|
| When to choose each model | Claude Opus 4.6 Claude Opus 4.6 is stronger when you prioritize Free providers, Recent tests. | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Average speed, First-token latency, Provider coverage. |
TL;DR: GPT-5.3 Codex leads across 110 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from Claude Opus 4.6 vs GPT-5.3 Codex into nearby model comparisons with enough verified LMSpeed data.
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
