Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude 3 Opus
--
GPT-5.3 Codex
89
Benchmark data for Claude 3 Opus and GPT-5.3 Codex is coming soon on BenchLM.
Claude 3 Opus
GPT-5.3 Codex
$null / $null
$2.5 / $10
N/A
79 t/s
N/A
88.26s
200K
400K
Benchmark data for Claude 3 Opus and GPT-5.3 Codex is coming soon on BenchLM.
BenchLM does not have sourced benchmark coverage for Claude 3 Opus yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
GPT-5.3 Codex has the larger context window at 400K, compared with 200K for Claude 3 Opus.
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still 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.
Claude 3 Opus: Pricing unavailable GPT-5.3 Codex: $2.50 input / $10.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.