Day 7 · 2026-10-30
15 launches checked60 claims quoted word for word113 user reports linked10 verified fixes linked26 corrections publishedLive 7 days5 of 5 founding sponsor spots left
Day 7Launch day vs. day 7
AI launches, checked against real usersLast re-stamped 30 Oct 2026

AI models / Compare

Claude Opus 5.5 vs GPT-6.1 Terra: which delivered after 7 days?

Claude Opus 5.5 is stamped Delivered; GPT-6.1 Terra is still Too early to call, so this comparison isn't settled yet.

Claude Opus 5.5GPT-6.1 Terra
VerdictDeliveredToo early
Claims held23
Claims mixed20
Claims failed01
Claims unclear10
User reports102
Launched22 Sept 202626 Oct 2026
Last stamped30 Oct 202630 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. 011 · OpenAI

GPT-6.1 Terra

Day 4 of 7
Too earlyDay 7 verdict

Cheap and the coding gain is real, but independent timing finds it about 15 to 25% faster than Sol, nowhere near 3x.

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

What they claimed

“At max effort, Terra is over three times as token efficient as Claude Opus 5.5, and one-fourth its price per token, resulting in a ~9x lower cost per task.”
✓ Holds
“Terra is also much quicker, completing tasks over three times faster than both GPT-6 Astra and GPT-6.1 Sol.”
✗ Fails
“At maximum reasoning effort, GPT‑6.1 Terra solves 50.3% of tasks, more than double GPT‑5.6 Terra’s published score of 21.5%.”
✓ Holds
“Standard API pricing is $1 per million input tokens, $0.05 per million cached input tokens, and $5 per million output tokens.”
✓ Holds

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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