Day 7 · 2026-10-31
18 launches checked71 claims quoted word for word121 user reports linked10 verified fixes linked26 corrections publishedLive 8 days5 of 5 founding sponsor spots left
Day 7Launch day vs. day 7
AI launches, checked against real usersLast re-stamped 31 Oct 2026

AI models / Compare

Claude Opus 5.5 vs Mistral Large 4: which delivered after 7 days?

Claude Opus 5.5 is stamped Delivered; Mistral Large 4 is still Too early to call, so this comparison isn't settled yet.

Claude Opus 5.5Mistral Large 4
VerdictDeliveredToo early
Claims held21
Claims mixed20
Claims failed00
Claims unclear12
User reports103
Launched22 Sept 202629 Oct 2026
Last stamped30 Oct 202631 Oct 2026

No. 002 · Anthropic

Claude Opus 5.5

DeliveredDay 7 verdict

The 20% price cut and 30% speed-up check out, and Epoch and Agent Arena put it at Fable level. It uses more tokens, so cost per task isn't 40% lower.

Launched
22 Sept 2026
Stamped
30 Oct 2026
Claims
✓2 held · ~2 mixed · ✗0 failed · ?1 unclear
Reports
10 (2 praise · 7 problem · 1 mixed)

What they claimed

“It performs at the level of Claude Fable 5.1 on most work and costs 40% less to run than Opus 5.”
~ Mixed
“Input and output tokens are $4 and $20 per million, 20% less than Opus 5.”
✓ Holds
“In addition to the price drop, we’re increasing five-hour usage limits on Pro, Max, Team, and seat-based Enterprise plans.”
~ Mixed
“It is much less likely than recent models to take hard-to-reverse actions or act outside the boundaries it’s been given”
? Unclear
“Opus 5.5 also generates output more than 30% faster than Opus 5.”
✓ Holds

Full receipt

No. 017 · Mistral AI

Mistral Large 4

Day 2 of 7
Too earlyDay 7 verdict

Weights are out, but few hands-on reports yet; the cybersecurity claim leans on one index and is untested by users.

Launched
29 Oct 2026
Stamped
31 Oct 2026
Claims
✓1 held · ~0 mixed · ✗0 failed · ?2 unclear
Reports
3 (0 praise · 3 problem · 0 mixed)

What they claimed

“ML4 is one of the world's strongest AI models for cybersecurity.”
? Unclear
“We will release the weights by the end of the month.”
✓ Holds
“significantly outperforming any open-weight model developed in the US or Europe”
? Unclear

Full receipt

Both stamps come from the public user reports linked on each receipt, under the same method. Verdicts are opinion and are never paid for.

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