← LLM 
OpenAI
gpt-5
reasoning
Measured 2026-10-04
Run gpt-5 on Speko →One API, every model on this board.
Score
40
Task done
75.61%
58–91% 95% CI bootstrap over items · n=95 · measured 2026-10-04
Refusal quality
84.4%
names the gap 77% · offers a route 77% · 10 probes x 3 iterations
Fabrication
7%
2 of 30 probe runs
Dead-air
69.5%
223 of 321 turns
Tool silence
100.0%
all of 19 items (223 tool-call turns) · ≥82%
Stalled
24.4%
22 of 90 runs
TTFT p50
1.86s
1.86–8.35s p50–p90 · n=38
Cost / 1M tok
$10.00
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