Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
GPT-5.1
--
GPT-5.3 Codex
89
Benchmark data for GPT-5.1 and GPT-5.3 Codex is coming soon on BenchLM.
GPT-5.1
GPT-5.3 Codex
$1.5 / $6
$2.5 / $10
111 t/s
79 t/s
57.47s
88.26s
200K
400K
Benchmark data for GPT-5.1 and GPT-5.3 Codex is coming soon on BenchLM.
BenchLM does not have sourced benchmark coverage for GPT-5.1 yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
GPT-5.3 Codex is priced at $2.50 input / $10.00 output per 1M tokens, versus $1.50 input / $6.00 output per 1M tokens for GPT-5.1. GPT-5.3 Codex has the larger context window at 400K, compared with 200K for GPT-5.1.
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.
GPT-5.1: $1.50 input / $6.00 output per 1M tokens 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.
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