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2026 AI Knowledge Cutoff Dates

25 AI models in this database have a 2026 knowledge cutoff. The latest is Fugu Ultra v2 on 2026-08-28.

Data sourced from OpenRouter API and manual data collection | Last updated: Nov 3, 2026, 8:01 AM UTC

Model NameKnowledge CutoffFreshness Score
Sakana: Fugu Ultra v2
2026-08-28
97
Anthropic: Claude Fable 5.1
2026-06-30
94
Anthropic: Claude Opus 5.5
2026-06-30
94
Anthropic: Claude Sonnet 5.5
2026-06-30
94
Reflection: Beam 1.0 501B A23B
2026-06-30
94
Anthropic: Claude Opus 5
2026-05-31
93
SpaceXAI: Grok 4.7
2026-05-31
93
OpenAI: GPT-6 Luna
2026-05-18
92
OpenAI: GPT-6 Astra
2026-04-30
91
OpenAI: GPT-6.1 Sol
2026-04-30
91
OpenAI: GPT-6 Sol
2026-04-20
91
Google: Gemini 3.7 Flash
2026-03-31
90
Google: Gemini 3.8 Flash
2026-03-31
90
OpenAI: GPT-5.6 Luna
2026-02-16
88
OpenAI: GPT-5.6 Luna Pro
2026-02-16
88
OpenAI: GPT-5.6 Sol
2026-02-16
88
OpenAI: GPT-5.6 Sol Pro
2026-02-16
88
OpenAI: GPT-5.6 Terra
2026-02-16
88
OpenAI: GPT-5.6 Terra Pro
2026-02-16
88
SpaceXAI: Grok 4.5
2026-02-01
87
SpaceXAI: Grok 4.6
2026-02-01
87
Anthropic: Claude Fable 5
2026-01-31
87
Anthropic: Claude Opus 4.7
2026-01-31
87
Anthropic: Claude Opus 4.8
2026-01-31
87
Anthropic: Claude Sonnet 5
2026-01-31
87

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Frequently asked questions

Which AI models have a 2026 knowledge cutoff?

25 AI models in this database have a 2026 knowledge cutoff. The latest is Fugu Ultra v2 on 2026-08-28.

What does a 2026 knowledge cutoff mean?

These models stopped learning from training data at some point in 2026. Each one can only reflect events up to its own cutoff date.