Claude Opus 4.6 is the stronger all-rounder.Seed 2.0 is cheaper.
Scores updated · 6 tests both models report · How we compare
Where each one wins
Tests won in each of the four 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.
Agents, reasoning and math 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.
Seed 2.0 costs 88% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Opus 4.6 pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+6.7points ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+4.3points ahead
- US invitational high-school math exam problemsAIME 2026+2.5points ahead
Where Seed 2.0 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 6 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.6
- SWE-bench VerifiedClaude Opus 4.6 by 4.380.876.5+4.3
- LiveCodeBench v6Claude Opus 4.6 by 188.887.8+1
Other results1 test, 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.
- AIME 2025Claude Opus 4.6 by 1.599.898.3+1.5
Questions people ask
Which is better, Claude Opus 4.6 or Seed 2.0?
Claude Opus 4.6 wins three of the four areas where both have results: coding, agents and math. Seed 2.0 wins none, but costs 88% less. They are level on reasoning.
Which is better for coding?
Claude Opus 4.6. It wins 2 of the 2 coding tests both models report; Seed 2.0 wins none.
Which is cheaper?
Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Seed 2.0 costs $0.50 and $3.00. That makes Seed 2.0 about 88% cheaper for the same work.
How do you compare the two?
We use the 6 benchmark tests both models have published scores on. The verdict counts the 5 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 1 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.