GPT-6.1 Sol costs less per task than Sonnet 5.5 and Opus 5.5 at every effort
Bars: measured cost per task. List prices per 1M input / output tokens: $2 / $10 for GPT-6.1 Sol and Sonnet 5.5, $4 / $20 for Opus 5.5.
13 single-shot tasks, 3 repeats, 39 calls per bar.
Under each group: replies that were only the answer, as every prompt asked.
GPT-6.1 Sol
Claude Sonnet 5.5
Claude Opus 5.5
$0.000
$0.005
$0.010
$0.015
$0.020
$0.025
2.0
4.1
7.0
default
39/39 | 22/39 | 39/39
1.8
4.3
6.5
low
39/39 | 12/39 | 39/39
2.1
4.0
8.2
medium
39/39 | 24/39 | 39/39
2.5
4.3
8.8
high
39/39 | 30/39 | 39/39
3.3
5.9
10.5
xhigh
39/39 | 39/39 | 39/39
4.7
14.6
23.4
max
39/39 | 39/39 | 39/39
Bar labels are cost per 1,000 tasks in dollars.
With no effort set, GPT-6.1 Sol and Opus 5.5 run at medium and Sonnet 5.5 at high.
Measured 2026-09-29 and 2026-09-30 on the native APIs.