Which is better for coding — GPT-5.1 Thinking 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-5.1 Thinking or Mercury 2?

API pricing data is available on the individual model pages.

Which has a larger context window — GPT-5.1 Thinking or Mercury 2?

Context window data is available on the individual model pages.

GPT-5.1 Thinking vs Mercury 2: Specs & Benchmark Comparison

Characteristic	GPT-5.1 Thinking	Mercury 2
Company	OpenAI	Inception
Release Date	November 11, 2025	February 1, 2026
Parameters	—	—
Multimodal	Yes	No
Context (input)	256K	—
Context (output)	128K	—
Input Price / 1M	$3.00	—
Output Price / 1M	$12.00	—
Average Score	0.9	0.7
Benchmarks
GPQA	0.9	0.7
AIME 2025	0.9	0.9

Visual Benchmark Comparison

GPT-5.1 Thinking

Mercury 2

GPQA0.9 vs 0.7

0.9

0.7

AIME 20250.9 vs 0.9

0.9

Verdict

Mercury 2 leads in 1 out of 2 comparison categories.

Overall Performance

Both models show comparable average scores: GPT-5.1 Thinking — 0.9, Mercury 2 — 0.7.

Recency

Mercury 2 is newer: released 2/1/2026 vs 11/11/2025.

More About These Models

GPT-5.1 Thinking

OpenAI — specs, benchmarks, API

Mercury 2

Inception — specs, benchmarks, API

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All model comparisons →

The GPT-5.1 Thinking 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-5.1 Thinking or Mercury 2 page. See also the complete list of AI model comparisons.