GPT-5.4 vs Mercury 2: Specs & Benchmark Comparison
| Characteristic | GPT-5.4 | Mercury 2 |
|---|---|---|
| Company | OpenAI | Inception |
| Release Date | March 5, 2026 | February 1, 2026 |
| Parameters | — | — |
| Multimodal | Yes | No |
| Context (input) | 1.0M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $2.50 | — |
| Output Price / 1M | $15.00 | — |
| Average Score | 0.9 | 0.7 |
| Benchmarks | ||
| GPQA | 0.9 | 0.7 |
Visual Benchmark Comparison
GPT-5.4
Mercury 2
GPQA0.9 vs 0.7
0.9
0.7
Verdict
GPT-5.4 leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.4 — 0.9, Mercury 2 — 0.7.
Recency
GPT-5.4 is newer: released 3/5/2026 vs 2/1/2026.
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Frequently Asked Questions
Which is better for coding — GPT-5.4 or Mercury 2?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.4 or Mercury 2?
API pricing data is available on the individual model pages.
Which has a larger context window — GPT-5.4 or Mercury 2?
Context window data is available on the individual model pages.
The GPT-5.4 and Mercury 2 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.4 or Mercury 2 page. See also the complete list of AI model comparisons.