AI models / Compare
Claude Opus 5.5 vs GPT-6.1 Sol: which delivered after 7 days?
Same stamp after day 7: both Claude Opus 5.5 and GPT-6.1 Sol are stamped Partly. The claim tallies below show where each one held and where it didn't.
| Claude Opus 5.5 | GPT-6.1 Sol | |
|---|---|---|
| Verdict | Partly | Partly |
| Claims held | 0 | 0 |
| Claims mixed | 3 | 3 |
| Claims failed | 0 | 0 |
| Claims unclear | 2 | 2 |
| User reports | 7 | 5 |
| Launched | 22 Sept 2026 | 29 Sept 2026 |
| Last stamped | 22 Oct 2026 | 22 Oct 2026 |
No. 002 · Anthropic
Claude Opus 5.5
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
No. 004 · OpenAI
GPT-6.1 Sol
It arrived and Ultrafast followed, but 'available today' took app updates for many users, Ultrafast is limited to top plans, and some users report over-refusals.
- Launched
- 29 Sept 2026
- Stamped
- 22 Oct 2026
- Claims
- ✓0 held · ~3 mixed · ✗0 failed · ?2 unclear
- Reports
- 5 (0 praise · 3 problem · 2 mixed)
What they claimed
“GPT-6.1 Sol is available starting today to all Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex.”~ Mixed
“In the coming days, we’ll also offer GPT-6.1 Sol Ultrafast, with up to 8x faster token generation compared to its standard speed in Codex.”~ Mixed
“GPT-6.1 Sol is more transparent about its limitations and more reliable at respecting user intent and safety constraints.”~ Mixed
“We’re introducing GPT-6.1 Sol, an upgrade to GPT-6 Sol that nearly matches GPT-6 Astra’s intelligence on agentic coding, computer use, and professional work at one-fifth of Astra’s standard input and output token prices.”? Unclear
“Its standard API prices are $2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens.”? Unclear
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
- Claude Opus 5.5 alternatives
- GPT-6.1 Sol alternatives
- Claude Opus 5.5 vs DeepSeek-V4.1-Flash-1017
- Claude Opus 5.5 vs EmbeddingGemma 2
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs LFM3
- Claude Opus 5.5 vs Muse Spark Open
- DeepSeek-V4.1-Flash-1017 vs GPT-6.1 Sol
- EmbeddingGemma 2 vs GPT-6.1 Sol
- Gemini 4 Argon vs GPT-6.1 Sol
Weekly email · Fridays 14:00 CEST
Get the Friday Receipt
Every Friday: the week’s new day 7 receipts, the ones we re-stamped, and any corrections. One email, no sponsors from companies we review.
Prefer not to give an email? Follow the RSS feed or @day7dev on X.