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October 5, 2026

This week in AI models: GPT-6.1 Sol, Claude Sonnet 5.5

What each of this week’s 2 new AI models changed, with the numbers and their sources, and which lines could ship next.

What shipped
● OpenAI · GPT · Sep 29
GPT-6.1 Sol
One week after GPT-6 Sol, it scores 7 points higher on computer-use tasks and 4 points higher on the all-round intelligence index at the same $2 / $10 price.
Compared with GPT-6 Sol · the model it replaces
71.4% ▲ up from 64.4% · +7 points · both at max effort
Completes 7 in 10 tasks when operating a computer on its own · OSWorld 2.0
$2 / $10 same as GPT-6 Sol · cached input halved to $0.10
Costs the same as the model it replaces · Price per 1M tokens
Full card and timeline →
Sources: OpenAI · Artificial Analysis · Artificial Analysis (2)
● Anthropic · Claude Sonnet · Sep 28
Claude Sonnet 5.5
Scores 18 points higher than Sonnet 5 on the all-round intelligence index and runs over 30% faster, at the same $2 / $10 price per 1M tokens.
Compared with Claude Sonnet 5 · the model it replaces
55.5% ▲ up from 34.1% · +21.4 points
Makes the right code edits more than half the time inside an editor · CursorBench 4.0
$2 / $10 same as Claude Sonnet 5
Costs the same as the model it replaces · Price per 1M tokens
Full card and timeline →
Sources: Anthropic · Artificial Analysis · VentureBeat
Coming next
Announced by the maker, not out yet
● Gemini 4 Argon · Google · announced Sep 30 · expected as soon as possible · open only to selected partners so far
“Today, we’re announcing our new frontier model, Gemini 4 Argon, which is rolling out to a set of trusted cyber defenders through our Fairwind Program.” Google
● Gemini 3.5 Pro · Google · announced May 19 · open only to selected partners so far · promised for June 2026, still not out
“We’re also hard at work on 3.5 Pro. It's already being used internally, and we look forward to rolling it out next month.” Google
● Claude Haiku 5.5 · Anthropic · announced Sep 22 · expected in the coming weeks
“Claude Sonnet 5.5 and Claude Haiku 5.5 will follow in the coming weeks, with many of the same improvements to performance, efficiency, and safety.” Anthropic
● Grok 4.8 · xAI · announced Sep 14
“Grok 4.8, which is a 2.5T model trained with our new C++ software stack, will finish training this week and start RL” Elon Musk on X
Close to their usual gap
Time since the last release is close to the usual gap between this line’s models. We don’t predict dates.
● Imagen & Nano Banana · Google · last: Nano Banana 2 Lite (Gemini 3.1 Flash-Lite Image)
97 days since the last release — usual gap is 98
See where every line stands →
Next AI Model checks 9 AI makers for new models every morning. Every number comes from the maker or an independent test, with its source. One email a week, only when something ships.
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← Newer This week in AI models: Claude Haiku 5.5, Nano Banana 2.1, Mistral Large 4 +3 more Older → This week in AI models: GPT-6 Sol, GPT-6 Luna, Claude Opus 5.5 +3 more
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