GPT-5.6 Sol vs Grok 4.20 (Beta Reasoning)
Wins 3 of 3 areas
Coding · Reasoning · Images and charts
Wins 0 of 3 areas
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GPT-5.6 Sol is the stronger all-rounder.
Scores updated · 3 tests both models report · How we compare
Where each one wins
Tests won in each of the three 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.
Coding, reasoning and images and charts rest on a single test each.
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.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where GPT-5.6 Sol pulls ahead
- Solves new puzzle games it has never seenARC-AGI-3+7.7points ahead
Where Grok 4.20 (Beta Reasoning) pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 3 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- LMArena · WebDevGPT-5.6 Sol by 243 rating points16181375+243 rating
Images and chartsGPT-5.6 Sol
- LMArena · VisionGPT-5.6 Sol by 16 rating points12791263+16 rating
Questions people ask
Which is better, GPT-5.6 Sol or Grok 4.20 (Beta Reasoning)?
GPT-5.6 Sol wins all three areas where both have results: coding, reasoning and images and charts. Grok 4.20 (Beta Reasoning) wins none.
Which is better for coding?
GPT-5.6 Sol. It wins the one coding test both models report.
How do you compare the two?
We use the 3 benchmark tests both models have published scores on. The verdict counts the 3 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. Each score is the one shown on the model's own page.