Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Mythos 5
99
GPT-5.1
77
Verified leaderboard positions: Claude Mythos 5 #1 · GPT-5.1 unranked
Benchmark data for Claude Mythos 5 and GPT-5.1 is coming soon on BenchLM.
Claude Mythos 5
GPT-5.1
$10 / $50
$1.25 / $10
N/A
111 t/s
N/A
57.47s
1M+
200K
Benchmark data for Claude Mythos 5 and GPT-5.1 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.
Claude Mythos 5 is priced at $10.00 input / $50.00 output per 1M tokens, versus $1.25 input / $10.00 output per 1M tokens for GPT-5.1. Claude Mythos 5 has the larger context window at 1M+, 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.
Claude Mythos 5: $10.00 input / $50.00 output per 1M tokens GPT-5.1: $1.25 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.