Model Comparison
GPT-5.4 Pro (xhigh)
vs. GPT-5 Codex (high)
Comparing 2 AI models · 10 benchmarks · OpenAI
Recommended Pick
Op GPT-5 Codex (high) 4 metric wins Strongest on: Input price, Output price, Blended price
Lowest Price
GPT-5 Codex (high)
$1.25/1M input price
Best for Coding
GPT-5 Codex (high)
38.9 coding index
Composite Indices
Higher is better; speed and price are normalized
Standard Benchmarks
Only benchmarks with data are shown
Differences That Matter
Price gap
GPT-5 Codex (high) is 24x cheaper on input tokens than GPT-5.4 Pro (xhigh).
Top-pick rationale
GPT-5 Codex (high) wins 4 measurable categories, including Input price, Output price, Blended price, Throughput.
Response Face-Off
Run one prompt through the selected models and compare response quality with live speed and cost context.
GPT-5.4 Pro (xhigh)
OpenAI
TTFT
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Time
—
tok/s
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Tokens
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Cost
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GPT-5 Codex (high)
OpenAI
TTFT
—
Time
—
tok/s
—
Tokens
—
Cost
—
Which answer was more useful?
Full Comparison
| Metric | Op GPT-5.4 Pro (xhigh) | Top Pick Op GPT-5 Codex (high) |
|---|---|---|
| Pricing per 1M tokens | ||
| Input Cost | $30.00/1M | $1.25/1M |
| Output Cost | $180.00/1M | $10.00/1M |
| Blended (3:1) | $67.50/1M | $3.44/1M |
| Specifications | ||
| Organization | OpenAI | OpenAI |
| Release Date | Mar 5, 2026 | Sep 23, 2025 |
| Performance & Speed | ||
| Throughput | — | 200.0 tok/s |
| TTFT | — | 8040ms |
| Latency | — | 8040ms |
| Composite Indices | ||
| Value Score | — | 100.0 |
| Reasoning Score | — | 70.3 |
| Intelligence | — | 44.6 |
| Coding | — | 38.9 |
| Math | — | 98.7 |
| Standard Benchmarks | ||
| GPQA | — | 83.7% |
| MMLU Pro | — | 86.5% |
| HLE | — | 25.6% |
| LiveCodeBench | — | 84.0% |
| AIME 2025 | — | 98.7% |
| SciCode | — | 40.9% |
| LCR | — | 69.0% |
| IFBench | — | 74.1% |
| TAU-bench v2 | — | 86.8% |
| TerminalBench Hard | — | 37.9% |
Key Takeaways
GPT-5 Codex (high) offers the best value at $1.25/1M, making it ideal for high-volume applications and cost-conscious projects.
GPT-5 Codex (high) reaches a 38.9 coding index, making it the top choice for software development and code generation tasks.
All models support context windows of ∞+ tokens, suitable for processing lengthy documents and maintaining extended conversations.
When to Choose Each Model
GPT-5.4 Pro (xhigh)
- General-purpose AI
- Versatile applications
GPT-5 Codex (high)
- Cost-sensitive applications
- High-volume processing
- Code generation
- Software development
