Claude Sonnet 4.6 vs Gemini 2.5 Flash: which is better?

Claude Sonnet 4.6 leads on combined benchmark scores (86.5 vs 85.9) across general knowledge, coding, and math, as of 2026-07-27.

Which is cheaper, Claude Sonnet 4.6 or Gemini 2.5 Flash?

Gemini 2.5 Flash is cheaper on a typical API workload, at roughly 7.3x lower cost than the alternative at published per-token rates.

Claude Sonnet 4.6 vs Gemini 2.5 Flash

Claude Sonnet 4.6 leads on benchmarks; Gemini 2.5 Flash is cheaper to run, about 7.3× less.

Updated 2026-07-27

Claude Sonnet 4.6

Anthropic · Closed

86.5

Combined index

Leads

Gemini 2.5 Flash

Google · Closed

85.9

Combined index

Benchmarks

General knowledge (MMLU)

88.3

87.5

Coding

87.1

Math

84.2

89.2

API pricing

$3.0 Input / 1M $0.3

$15.0 Output / 1M $2.5

$135.0 Monthly, est. $18.5

Monthly estimate assumes 20M input + 5M output tokens. Prices marked ~ are representative hosted rates for open-weight models and vary by provider. Run your own numbers in the cost calculator.

Claude Sonnet 4.6 costs → Gemini 2.5 Flash costs → Full leaderboard → All comparisons →