Unverified: Pirat_Nation Relays a Leak Claiming Claude Opus 5.6 Is Coming With 90% on SWE and a 20% Lower Price
Anthropic may be preparing a major Claude upgrade. A leak from @kimmonismus reports Claude Opus 5.6 is coming with Mythos and Fable 5.5. The leaked numbers: -61 on the AA Index -90% on SWE -81% on RiemannBench -20% cheaper The new model is also said to be less robotic, less picky, and more natural to talk to with higher usage limits
Context
If the leaked numbers hold, Anthropic's next Opus would raise the bar for coding agents while cutting prices, but nothing has been confirmed.
Anthropic's current top public models are Claude Opus 5.5 and the restricted Mythos line, and several unconfirmed leaks this week have pointed to new Claude releases. Pirat_Nation is a news and gaming account that relays claims from other posters. Anthropic has not announced a Claude Opus 5.6.
Deep dive
Pirat_Nation (@Pirat_Nation) posted on the evening of Nov 1, Eastern time, that Anthropic may be preparing a major Claude upgrade. The post credits a leak to Chubby (@kimmonismus) and says Claude Opus 5.6 is coming along with Mythos and Fable 5.5.
The post lists what it calls the leaked numbers: 61 on the AA Index, which refers to Artificial Analysis's intelligence index, 90% on SWE, 81% on RiemannBench and a price 20% lower. It also says the new model is said to be less robotic, less picky and more natural to talk to, with higher usage limits.
None of this is confirmed. Anthropic has not announced Opus 5.6, has not published any of these scores, and the post does not include a screenshot of a benchmark table, a model card or a pricing page. The two images attached are a Claude logo and a generic network illustration. The post also does not say which SWE benchmark the 90% figure refers to, and RiemannBench results could not be matched to any public leaderboard entry for an unreleased Claude model.
The claim fits a busy week of Claude rumours. Earlier on Nov 1, Chubby reported that the name Claude Mythos 5.5 appeared in code on Anthropic's website, a story ranked higher in this deck, and other posters said a Fable 5.5 checkpoint was being tested. Anthropic has said nothing publicly about release dates. Readers should treat every number in this post as an unverified secondhand claim until Anthropic publishes a model card.
What to expect next
The test is simple: whether Anthropic publishes an Opus 5.6 model card, and whether its scores and pricing match the leak. Watch Artificial Analysis and the SWE leaderboards for any new Claude entry. If no release follows in the coming weeks, these numbers should be treated as rumour. A real price cut would put pressure on OpenAI and Google pricing for coding agents.