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.

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.

More About These Models

GPT-5.4

OpenAI — specs, benchmarks, API

Mercury 2

Inception — specs, benchmarks, API

Related Comparisons

GPT-5.1 High vs GPT-5.4 GPT-5 High vs GPT-5.4 GPT-5.1 Thinking vs GPT-5.4 GPT-5.1 Codex High vs GPT-5.4 GPT-5.2 vs GPT-5.4 GPT-5 Medium vs GPT-5.4

All model comparisons →

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.