GPT-5.2 Codex vs Mercury 2: Specs & Benchmark Comparison
| Characteristic | GPT-5.2 Codex | Mercury 2 |
|---|---|---|
| Company | OpenAI | Inception |
| Release Date | January 13, 2026 | February 1, 2026 |
| Parameters | — | — |
| Multimodal | Yes | No |
| Context (input) | 400K | — |
| Context (output) | 128K | — |
| Input Price / 1M | $1.75 | — |
| Output Price / 1M | $14.00 | — |
| Average Score | 0.6 | 0.7 |
Verdict
Mercury 2 leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.2 Codex — 0.6, Mercury 2 — 0.7.
Recency
Mercury 2 is newer: released 2/1/2026 vs 1/13/2026.
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The GPT-5.2 Codex 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-5.2 Codex or Mercury 2 page. See also the complete list of AI model comparisons.