Claude Sonnet 5.5
Knows up to June 2026Missing 711 events
claude-sonnet-5-5
$2 in, $10 out per 1M tokens
Made by Anthropic
Claude Haiku 5.5 is living in June 2026.
Here is what it has never seen, with a source for every claim.
711AI events since then, each with sources
- 36 of them historic
- 112 new AI models it has never heard of in our model registry
- 100 days of news to catch up on
It launched on 7 October 2026, already missing 671 of them.
Published cutoffs can overstate what a model knows. What is a cutoff?
Model ids, prices and docs: Claude Haiku 5.5 in the model registry
Five things it has never heard of
-
Anthropic releases Claude Opus 5.5
Confirmed
-
OpenAI agents escape evaluation sandbox and autonomously hack Hugging Face
Confirmed
-
Google announces Gemini 4 Argon, its new frontier model, first released only to cyber defenders via the Fairwind Program
Confirmed
-
Trump hosts AI CEOs at the White House
Confirmed
-
Meta launches Muse, a free consumer personal AI agent
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 Claude Haiku 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 228 at launch, 771 today
- Claude Opus 5.5 305 at launch, 711 today
- Gemini 3.8 Flash 246 at launch, 794 today
- Grok 4.7 317 at launch, 740 today
- Claude Haiku 5.5 671 at launch, 711 today
Show as a table
| Model | Cutoff | Released | Missing at launch | Missing today |
|---|---|---|---|---|
| GPT-6 Astra | April 2026 | 3 September 2026 | 228 | 771 |
| Claude Opus 5.5 | June 2026 | 22 September 2026 | 305 | 711 |
| Gemini 3.8 Flash | March 2026 | 2 September 2026 | 246 | 794 |
| Grok 4.7 | May 2026 | 21 September 2026 | 317 | 740 |
| Claude Haiku 5.5 | June 2026 | 7 October 2026 | 671 | 711 |
Your card
This is the image people see when you share this page. It links back here, with the sources.
postcutoff.com/you/claude-haiku-5-5.Other models from Anthropic
With their training cutoffs and what each is missing.
All 17 models from AnthropicClaude Opus 5.5
Knows up to June 2026Missing 711 events
claude-opus-5-5
$4 in, $20 out per 1M tokens
Claude Fable 5.1
Knows up to June 2026Missing 711 events
claude-fable-5-1
$10 in, $50 out per 1M tokens
Claude Mythos 5.1
Knows up to June 2026Missing 711 events
claude-mythos-5-1
$10 in, $50 out per 1M tokens
Claude Opus 5
Knows up to May 2026Missing 740 events
claude-opus-5
$5 in, $25 out per 1M tokens
Claude Sonnet 5
Knows up to January 2026Missing 840 events
claude-sonnet-5
$2 in, $10 out per 1M tokens
Claude Fable 5
Knows up to January 2026Missing 840 events
claude-fable-5
$10 in, $50 out per 1M tokens
Claude Opus 4.8
Knows up to January 2026Missing 840 events
claude-opus-4-8
$5 in, $25 out per 1M tokens