Unverified DeepSeek V4.1F stuns in user tests, but Opus still 'untouchable'

On October 17, teortaxesTex, a well-known account in the AI community, posted a series of threads showcasing hands-on results from a model called DeepSeek V4.1F-1017. The model itself is unverified, and all claims come solely from this author's account.

Confirmed (as relayed from the author's testing)

• The model built in about 5 minutes a piece that previously took Opus roughly $2 in API costs to complete; the author noted earlier DeepSeek versions had physics-explosion bugs, but after a single piece of feedback the second version ran fully autonomously and felt noticeably stronger
• In another example, the model produced a 3D interactive gummy-bear webpage in the style of "Gummy Bears / Gelatine Studies" from a prompt in about 5 minutes
• The author repeatedly showed the model's nacre (mother-of-pearl) folding-fan visualization: an 11-blade aragonite brise fan, labeled with structural details like CACO₃/aragonite and third-order Bragg stacking, with exquisite pearlescent finish and expand/collapse interaction; the iridescent materials and lighting were described as extremely realistic
• Behavioral observations: the new version's visual capabilities are markedly better, and it no longer easily "convinces itself everything is fine" or hallucinates nonexistent features

Unconfirmed

• The existence and specifications of DeepSeek V4.1F-1017 itself have not been officially confirmed in any way
• The true layered structure of nacre has still not been reproduced by any model

Why it matters

• In discussion, the author said models keep improving and are approaching an asymptote, but believes Opus remains unmatched; the thread showcases frontier models' rapid iteration on physics simulation and material rendering, along with reliability gains from better visual self-checking, drawing wide attention online

2026-10-17 ~ 2026-10-17 · 5 related posts

Full story(2 episodes)→

• Episode 1: DeepSeek V4.1 Flash Now Free on OpenCode Coding Tool(2026-10-15, 2 posts)
• Episode 2: Unverified DeepSeek V4.1F stuns in user tests, but Opus still 'untouchable'(2026-10-17, 5 posts)

• [source] DeepSeek V4.1F beats Opus in 5-minute build test, 'unambiguously better' — teortaxesTex · 2026-10-17
• DeepSeek V4.1F leaks claimed to out-code Opus, builds 3D site in 5 minutes — teortaxesTex · 2026-10-17
• Newer model shows better visual self-correction, no longer gaslights itself on renders — teortaxesTex · 2026-10-17
• [source] Researcher shows AI-generated nacre fan: still not real nacre, but 'Opus is untouchable' — teortaxesTex · 2026-10-17
• "Opus Is Still Untouchable": Nacre Fan Render Stuns With Material Detail — teortaxesTex · 2026-10-17