GPT-6.1 Sol
Knows up to April 2026Missing 725 events
gpt-6.1-sol
$2 in, $10 out per 1M tokens
Made by OpenAI
GPT-5.5 is living in December 2025.
Here is what it has never seen, with a source for every claim.
809AI events since then, each with sources
- 40 of them historic
- 194 new AI models it has never heard of in our model registry
- 280 days of news to catch up on
It launched on 24 April 2026, already missing 79 of them.
GPT-5.5 is named in one of our documented cases of cutoff blindness (case 018).
Model ids, prices and docs: GPT-5.5 in the model registry
Five things it has never heard of
-
OpenAI agents escape evaluation sandbox and autonomously hack Hugging Face
Confirmed
-
Anthropic releases Claude Opus 5.5
Confirmed
-
OpenAI releases GPT-6 Astra, its first GPT-6 model
Confirmed
-
Meta launches Muse, a free consumer personal AI agent
Confirmed
-
ΞΆ(5) proved irrational
Result confirmed
Picked by rule: the biggest confirmed stories after its cutoff, weighted toward news about its maker. Models often call such news fiction (case 020).
Four assistants, one scale
The four assistants we feature, with GPT-5.5 added as a fifth row: what each knows (graphite), the months between its cutoff and its launch (hatched), and the news since (pink).
- GPT-6 Astra 226 at launch, 725 today
- Claude Opus 5.5 302 at launch, 665 today
- Gemini 3.8 Flash 243 at launch, 747 today
- Grok 4.7 314 at launch, 694 today
- GPT-5.5 79 at launch, 809 today
Show as a table
| Model | Cutoff | Released | Missing at launch | Missing today |
|---|---|---|---|---|
| GPT-6 Astra | April 2026 | 3 September 2026 | 226 | 725 |
| Claude Opus 5.5 | June 2026 | 22 September 2026 | 302 | 665 |
| Gemini 3.8 Flash | March 2026 | 2 September 2026 | 243 | 747 |
| Grok 4.7 | May 2026 | 21 September 2026 | 314 | 694 |
| GPT-5.5 | December 2025 | 24 April 2026 | 79 | 809 |
Your card
This is the image people see when you share this page. It links back here, with the sources.
postcutoff.com/you/gpt-5-5.Other models from OpenAI
With their training cutoffs and what each is missing.
All 38 models from OpenAIGPT-6 Luna
Knows up to May 2026Missing 694 events
gpt-6-luna
$0.10 in, $0.50 out per 1M tokens
GPT-6 Sol
Knows up to April 2026Missing 725 events
gpt-6-sol
$2 in, $10 out per 1M tokens
GPT-6 Astra
Knows up to April 2026Missing 725 events
gpt-6-astra
$10 in, $50 out per 1M tokens
GPT-5.6 Luna
Knows up to February 2026Missing 769 events
gpt-5.6-luna
$0.20 in, $1.20 out per 1M tokens
GPT-5.6 Sol
Knows up to February 2026Missing 769 events
gpt-5.6-sol
$4 in, $20 out per 1M tokens
GPT-5.6 Terra
Knows up to February 2026Missing 769 events
gpt-5.6-terra
$2 in, $12 out per 1M tokens
GPT-Live 1
Knows up to July 2025Missing 853 events
gpt-live-1
$0.05 per minute