Claude 3.5 Sonnet vs o3-pro
Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
o3-pro leads for most workloads.
- Claude 3.5 Sonnet is ~6.7× cheaper on input tokens — the budget pick.
Based on BenchLM composite scores, July 2026.
Claude 3.5 Sonnet
39
o3-pro
55
Benchmark data for Claude 3.5 Sonnet and o3-pro is coming soon on BenchLM.
Category Radar
Head-to-Head by Category
Operational Comparison
Claude 3.5 Sonnet
o3-pro
$3 / $15
$20 / $80
N/A
27 t/s
N/A
84.93s
200K
200K
Quick Verdict
Benchmark data for Claude 3.5 Sonnet and o3-pro is coming soon on BenchLM.
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
o3-pro is priced at $20.00 input / $80.00 output per 1M tokens, versus $3.00 input / $15.00 output per 1M tokens for Claude 3.5 Sonnet.
Benchmark Deep Dive
Frequently Asked Questions (3)
Can I compare Claude 3.5 Sonnet and o3-pro on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Claude 3.5 Sonnet and o3-pro today?
Claude 3.5 Sonnet: $3.00 input / $15.00 output per 1M tokens o3-pro: $20.00 input / $80.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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