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Gemini 3 Pro vs GPT-5.6 Luna

Google · released

Wins 2 of 7 areas

Facts · Images and charts

OpenAI · released

Wins 4 of 7 areas

Coding · Agents · Reasoning · Math

GPT-5.6 Luna wins more areas, narrowly.Gemini 3 Pro is better at images and charts.

Scores updated · 36 tests both models report · How we compare

Where each one wins

Tests won in each of the seven areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.

What it costs

Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.

Gemini 3 Pro$2.00 to read · $12.00 to write$14Price from Artificial Analysis
GPT-5.6 Luna$0.20 to read · $1.20 to write$1.40Price from Artificial Analysis

GPT-5.6 Luna costs 90% less for the same work.

The biggest differences

The three tests each model wins by the widest margin. Scores are out of 100.

Where GPT-5.6 Luna pulls ahead

  • Abstract visual puzzles that people can solveARC-AGI-2+28.5points aheadGPT-5.6 Luna59.6Gemini 3 Pro31.1
  • Finds hard-to-locate facts by browsing the webBrowseComp+24.1points aheadGPT-5.6 Luna83.3Gemini 3 Pro59.2
  • Long, multi-file coding tasks in real codebasesSWE-bench Pro+19.4points aheadGPT-5.6 Luna62.7Gemini 3 Pro43.3

Where Gemini 3 Pro pulls ahead

  • Short factual questions, answered correctlySimpleQA Verified+31.9points aheadGemini 3 Pro72.9GPT-5.6 Luna41
  • Common-sense trick questionsSimpleBench+29.6points aheadGemini 3 Pro76.4GPT-5.6 Luna46.8
  • Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+13.1points aheadGemini 3 Pro55.8GPT-5.6 Luna42.7

Every test, side by side

All 36 tests both models report. The winning score is in its model's colour; marks a score checked independently.

CodingGPT-5.6 Luna

Full coding ranking

AgentsGPT-5.6 Luna

Full agents ranking

ReasoningGPT-5.6 Luna

Full reasoning ranking

FactsGemini 3 Pro

Full facts ranking

Images and chartsGemini 3 Pro

Full images and charts ranking

MathGPT-5.6 Luna

Full math ranking

Long documentsEven

Full long documents ranking

Other results12 tests, not counted

Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.

Questions people ask

Which is better, Gemini 3 Pro or GPT-5.6 Luna?

GPT-5.6 Luna wins four of the seven areas where both have results: coding, agents, reasoning and math. Gemini 3 Pro wins facts and images and charts. They are level on long documents.

Which is better for coding?

GPT-5.6 Luna. It wins 3 of the 4 coding tests both models report; Gemini 3 Pro wins 1.

Which is cheaper?

Gemini 3 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; GPT-5.6 Luna costs $0.20 and $1.20. That makes GPT-5.6 Luna about 90% cheaper for the same work.

How do you compare the two?

We use the 36 benchmark tests both models have published scores on. The verdict counts the 24 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 12 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.

Compare Gemini 3 Pro with

Google

Across the field

Compare GPT-5.6 Luna with

OpenAI

Across the field

All comparisons