Day 7 · 2026-10-30
15 launches checked60 claims quoted word for word87 user reports linked10 verified fixes linked6 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 Muse Spark Open: which delivered after 7 days?

Claude Opus 5.5 is stamped Partly; Muse Spark Open is still Too early to call, so this comparison isn't settled yet.

Claude Opus 5.5Muse Spark Open
VerdictPartlyToo early
Claims held00
Claims mixed31
Claims failed00
Claims unclear23
User reports76
Launched22 Sept 202615 Oct 2026
Last stamped22 Oct 202625 Oct 2026

No. 002 · Anthropic

Claude Opus 5.5

PartlyDay 7 verdict

The lower list price is real, but users report limits draining faster, more thinking tokens and safeguard false alarms, and nobody has independently confirmed the 40% saving.

Launched
22 Sept 2026
Stamped
22 Oct 2026
Claims
✓0 held · ~3 mixed · ✗0 failed · ?2 unclear
Reports
7 (1 praise · 6 problem · 0 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.”
? Unclear
“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”
~ Mixed
“Opus 5.5 also generates output more than 30% faster than Opus 5.”
? Unclear

Full receipt

No. 007 · Meta

Muse Spark Open

Too earlyDay 7 verdict

Ten days in, nobody independent has run the two-Mac-Studio setup, and Apple still lists the 512GB M5 Ultra as coming in late October.

Launched
15 Oct 2026
Stamped
25 Oct 2026
Claims
✓0 held · ~1 mixed · ✗0 failed · ?3 unclear
Reports
6 (2 praise · 3 problem · 1 mixed)

What they claimed

“Muse Spark Open is the first model in its class to run on your desktop using two Apple M5 Ultra Mac Studios with the latest MLX framework.”
~ Mixed
“Muse Spark Open is available today through API platforms at Baseten, Fireworks AI, Groq, Modal, Nebius, OpenRouter and Together AI.”
? Unclear
“We’re releasing the weights under the Muse Model License with limited commercial terms, which allow many developers to use the model for free.”
? Unclear
“Muse Spark Open is a natively multimodal model with 816B total parameters (42B active) and a 1M-token context window.”
? 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.

Keep comparingall AI models