Claude Opus 4.8 vs o3: which is better?

o3 leads on combined benchmark scores (95.1 vs 89.3) across general knowledge, coding, and math, as of 2026-07-27.

Which is cheaper, Claude Opus 4.8 or o3?

o3 is cheaper on a typical API workload, at roughly 2.8x lower cost than the alternative at published per-token rates.

Claude Opus 4.8 vs o3

o3 wins outright: higher benchmark scores and lower cost on a typical workload.

Updated 2026-07-27

Claude Opus 4.8

Anthropic · Closed

89.3

Combined index

OpenAI · Closed

95.1

Combined index

Leads

Benchmarks

General knowledge (MMLU)

89.5

91.6

Coding

95.8

Math

92.4

97.9

API pricing

$5.0 Input / 1M $2.0

$25.0 Output / 1M $8.0

$225.0 Monthly, est. $80.0

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 Opus 4.8 costs → o3 costs → Full leaderboard → All comparisons →