Skip to content
SOLVENCY

Head to head

GPT-4.1 vs Gemini 2.5 Pro

GPT-4.1: legacyGemini 2.5 Pro: legacyheavy tier

Verdict · modelled basis

Gemini 2.5 Pro costs 2.9x less per solved task.

On output token price alone, GPT-4.1 looks 1.3x cheaper (1.6x on input). The ranking reverses once you divide by pass rate — the cheaper tokens do not win the task.

Source: Aider polyglot benchmark · verified 2026-08-21 · prices from each provider's pricing page

Input $/M tokens

lower is better

  • GPT-4.1$2
  • Gemini 2.5 Pro$1.25

Output $/M tokens

lower is better

  • GPT-4.1$8
  • Gemini 2.5 Pro$10

Cost per solved task

modelled basis · lower is better

  • GPT-4.1$5.15
  • Gemini 2.5 Pro$1.76
GPT-4.1Gemini 2.5 Pro
Input $/Mtok$2$1.25
Output $/Mtok$8$10
Cached input $/Mtok$0.5$0.125
Pass rate52%83%
Pass rate sourceAiderAider
Cost basismodelledmodelled
Cost per solved task$5.15$1.76

verified 2026-08-21 · heavy task tier; measured rows ignore the tier· Methodology· GPT-4.1· Gemini 2.5 Pro