NEXT LEAKED MODEL
Claude Fable 5.5
Predicted next release from Anthropic · successor to Claude Fable 5.1 · What's known ↓
24 days past the rumoured windowClaude Fable 5.5
WINDOW CLOSED0.0% · NO RELEASE0%BY THEN
TUE 03 NOV
25 SEP10 OCT17 OCT
Model gallery
18 VIDEOS
Sonnet 5.5vsGPT-6.1@notjazii
Opus 5.5vsGPT-6 Astra@vib3coded
Opus 5.5vsGPT-6.1 Sol@lnkiai
Opus 5.5vsSonnet 5.5vsGPT-6.1 SolvsGPT-6 Astra@luckeyfaraday
Opus 5.5@maxt3chno
Opus 5.5vsGPT-6 Astra@vib3coded
Gemini 4 Aragon@dummerspast39
Opus 5.5vsGPT-6.1 Sol@FabianoFirmo
Sonnet 5.5vsGPT-6.1 Sol@SPAC89
Opus 5.5@bonsaixbt
Opus 5.5vsGPT-6 AstravsGemini 4 Aragon@AI_Screening
GPT-6.1 SolvsGPT-6 Astra@DanielZambrini
Sonnet 5.5vsGPT-6.1@arena
Opus 5.5vsGPT-6.1 Sol@ivanainai
Sonnet 5.5vsGPT-6 Astra@GKev1n
Sonnet 5.5vsOpus 5.5@filicroval
Sonnet 5vsSonnet 5.5@claudeai
Sonnet 5.5vsSonnet 5@AiBattle_
Claude Fable 5.5: what's known
Last checked 02 OCT 2026
Anthropic hasn't announced a Fable 5.5. Everything about it comes from a handful of X accounts, who say it's a fresh pretraining run due any day now.
- ANNOUNCED?
- No. Fable 5.1 is still the only Fable Anthropic lists. CONFIRMED
- WHEN?
- Late September or early October, so it's due now. RUMOUR
- WHAT IS IT?
- The first fresh pretraining run for the Fable line. Called Fable 5.2 until 10 September. RUMOUR
- HOW GOOD?
- Anthropic's most capable model. RUMOUR
- PRICE?
- Same as Fable 5. RUMOUR
- USABLE TODAY?
- Some users say Fable 5.1 is already being routed to it. Nothing proves which model answered. RUMOUR
TIMELINENewest first
- 02 OCT 2026CONFIRMED
Still no Fable 5.5 model ID, price, benchmarks or model card. Anthropic's model list and Claude Code both show Fable 5.1 as current.
SOURCE: KINGY AI ↗ - 01 OCT 2026RUMOUR
The same routing is happening on claude.ai and in Claude Code. Screenshots still show the Fable 5.1 label.
BY @CHETASLUA · VIA KINGY AI ↗ - 28 SEP 2026CONFIRMED
Claude Sonnet 5.5 released. Anthropic again named Haiku 5.5 as next, not Fable.
SOURCE: SILICONANGLE ↗ - 22 SEP 2026CONFIRMED
Claude Opus 5.5 released. Anthropic said Sonnet 5.5 and Haiku 5.5 would follow in the coming weeks, and didn't mention Fable.
SOURCE: CELLCOG ↗ - 18 SEP 2026RUMOUR
Picking Fable 5.1 in Claude Code is already routing to a newer Fable.
BY @NOTJAZII · VIA KINGY AI ↗ - 10 SEP 2026RUMOUR
The name changed to Fable 5.5, possibly launching late September or early October, as the first fresh pretraining run for the Fable class.
BY @MR_SALIO · VIA CELLCOG ↗ - 08 SEP 2026RUMOUR
Release at the end of September or early October.
BY @KIMMONISMUS · VIA CELLCOG ↗ - 05 SEP 2026RUMOUR
A new pretraining run is coming very soon. At this point it was called Fable 5.2.
BY @KIMMONISMUS · VIA CELLCOG ↗ - 01 SEP 2026CONFIRMED
Claude Fable 5.1 released. It's the current Fable model.
SOURCE: ANTHROPIC ↗ - 13 AUG 2026RUMOUR
Deployment has been slowed by restrictions.
BY @MR_SALIO · VIA CELLCOG ↗ - 13 AUG 2026RUMOUR
It will keep Fable 5 pricing.
BY @MR_SALIO · VIA CELLCOG ↗ - 13 AUG 2026RUMOUR
Fable 5.5 will be Anthropic's most capable model.
BY @MR_SALIO · VIA CELLCOG ↗
NO HANDS-ON COMPARISONS OF CLAUDE FABLE 5.5 YET. THEY'LL APPEAR IN THE GALLERY WHEN THEY'RE FILED.
Index
18 / 18
ENTRYMODELSDISCIPLINEDATE
Claude Sonnet 5.5 vs GPT-6.1J A Z I I (@notjazii): sonnet 5.5 vs gpt 6.1 terra tested both models with the same prompt at highest reasoning available and results came out totally different > sonnet took 1 hour 30 mins and cost $18 > terra took 10 mins and cost $1 after running this test i think there is no comparison between
Claude Sonnet 5.5GPT-6.1
SPEED & COST
26 OCT 2026
Claude Opus 5.5 vs GPT-6 AstraVib3Coded (@vib3coded): I just wanted a peaceful pond. Now the fish are having an earthquake and the frog has questions for the landlord 🐸😭 Asked Claude Opus 5.5 and GPT-6 Astra to make a jelly koi pond Opus made an entire gummy aquarium for $12.38. Thick, transparent, little pebbles inside. Give it
Claude Opus 5.5GPT-6 Astra
GENERAL
08 OCT 2026
Claude Opus 5.5 vs GPT-6.1 Solいのり (@lnkiai): AIに3Dアバター制作を頼んでみたら、作り方が違って面白かった！👇️ 左：Codex（GPT-6.1 Sol） Blenderで一からモデルを作成 右：Claude Code（Opus 5.5） 配布モデルやパーツを探して、組み合わせ・加工する方法を提案
Claude Opus 5.5GPT-6.1 Sol
CODING
06 OCT 2026
Claude Opus 5.5 vs Claude Sonnet 5.5 vs GPT-6.1 SolLuckey Faraday (@luckeyfaraday): GPT Astra vs GPT-6.1 Sol vs Sonnet 5.5 vs Opus 5.5. Which AI understands 3D best? I gave all four the exact same task: build an AK-47 from scratch. Same prompt. Same environment. Which one wins?
Claude Opus 5.5Claude Sonnet 5.5GPT-6.1 SolGPT-6 Astra
3D & SIMULATION
05 OCT 2026
I want open weights to WIN.Max (@maxt3chno): I want open weights to WIN. But since Opus 5.5 dropped, I haven't touched any Chinese models for weeks - WHY should i juggle 5 different subs and APIs - WHY should i waste my time researching which Chinese model is good at what - WHEN Opus 5.5 literally does it all in one
Claude Opus 5.5
GENERAL
05 OCT 2026
Claude Opus 5.5 vs GPT-6 AstraVib3Coded (@vib3coded): My jelly world now has its own island 😂🌴 Claude Opus 5.5 vs ChatGPT-6 Astra I prefer Opus’s water: the transparency, reflections, and a whole storm from moving the mouse. But Astra feels more like jelly - the edges bend and the whole island wobbles Estimated API cost: Opus
Claude Opus 5.5GPT-6 Astra
SPEED & COST
04 OCT 2026
Claude Opus 5.5 vs GPT-6.1 SolFabiano Firmo (@FabianoFirmo): GPT-6.1 Sol vs Claude Opus 5.5 building aircraft carriers in Blender.
Claude Opus 5.5GPT-6.1 Sol
DESIGN & UI
01 OCT 2026
When are we finally going to start seeing 3D assets created with AI in games?Bonsai 🌳 (@bonsaixbt): When are we finally going to start seeing 3D assets created with AI in games? Honestly, I think this strawberry from Claude Opus 5.5 would look great in some kind of farming game
Claude Opus 5.5
DESIGN & UI
30 SEP 2026
Claude Opus 5.5 vs GPT-6 AstraPranav Reddy (@AI_Screening): Previously, Gemini 4 Argon Here are three different outputs I got from the Gemini 4 Argon checkpoint when it was featured in the Arena. These three outperformed GPT-6 Astra and Claude opus 5.5. Now,Waiting and Excited to test it officially.
Claude Opus 5.5GPT-6 AstraGemini 4 Aragon
GENERAL
30 SEP 2026
Gemini 4 Aragon: Minecraft rebuilt in a single html.Binkg (@dummerspast39): Gemini 4 Aragon: Minecraft rebuilt in a single html. 5 Minutes. Credit: @Inmerson
Gemini 4 Aragon
DESIGN & UI
30 SEP 2026
GPT-6.1 Sol vs GPT-6 AstraDaniel Zambrini (@DanielZambrini): First comparison using GPT 6.1 Sol Considering Price, Time to complete and final Result how would you rank them? My rank: Opus Astra 6.1 Sol Sonnet
GPT-6.1 SolGPT-6 Astra
SPEED & COST
30 SEP 2026
Sonnet 5.5 XHigh vs GPT-6.1 Sol Ultra: better result, twice the costIam_ (@SPAC89): Sonnet 5.5 XHigh vs GPT-6.1 Sol Ultra, this was really impressive Sonnet ended up costing about twice as much to run, but it actually produced the better result in this test, My impression from this test and several others is that GPT 6.1 is still insanely efficient. Sonnet is
Claude Sonnet 5.5GPT-6.1 Sol
SPEED & COST
30 SEP 2026
Opus 5.5 vs GPT-6.1 Sol: the Mentos and Coke experimentIvana (@ivanainai): Opus 5.5 vs GPT 6.1 Sol. Same prompt. Same Mentos + Coke experiment. Two very different ideas of physics.
Claude Opus 5.5GPT-6.1 Sol
3D & SIMULATION
30 SEP 2026
Arena: frontier models building Ancient Rome, Q4 2025 to nowArena.ai (@arena): Watch the progress of frontier models in bringing Ancient Rome to life on Arena, from Q4 2025 to now. Scores for Claude Sonnet 5.5 by @AnthropicAI and GPT-6.1 by @OpenAI are coming soon. Real-world tasks from our global community of users power the Arena leaderboards. Head to
Claude Sonnet 5.5GPT-6.1
DESIGN & UI
29 SEP 2026
Sonnet 5.5 vs GPT-6 Astra on a 3D scenegKev1n (@GKev1n): 已经有人用 Sonnet 5.5 与 GPT 6 Astra 做三维视频对比了。 前几个礼拜风头无限，三维牛逼的 Astra 现在被秒的渣都不剩。。。。甚至 Sonnet 5 还更便宜。。。 这太疯狂了，Anthropic 感觉现在已经领先 OpenAI 不止一个档位了。
Claude Sonnet 5.5GPT-6 Astra
3D & SIMULATION
28 SEP 2026
Sonnet 5.5 beats Opus 5.5 on a single-file HTML buildfilipe (@filicroval): what the fuck, why is Sonnet 5.5 this good?? gave Sonnet and Opus 5.5 the exact same prompt. Sonnet came back with this masterpiece. all in a SINGLE HTML file. Sonnet won this one, it's not even close
Claude Sonnet 5.5Claude Opus 5.5
DESIGN & UI
28 SEP 2026
Sonnet 5.5 vs Sonnet 5: Tokyo voxel dioramaAiBattle (@AiBattle_): Claude Sonnet 5.5 VS Sonnet 5 - Tokyo Voxel Diorama Really Impressive output from Sonnet 5.5 Usage: Sonnet 5.5 (High): - Total Cost = $9.23 - Duration = 49m 5s - Output tokens = 380k Sonnet 5 (High): - Total Cost = $4.85 - Duration = 21m 50s - Output tokens = 123k
Claude Sonnet 5.5Claude Sonnet 5
3D & SIMULATION
28 SEP 2026
Sonnet 5 vs Sonnet 5.5: the history of the dinosaurs, animatedClaude (@claudeai): The history of the dinosaurs in under a minute by @kevin_t_ngo, animated in JavaScript from the same prompt, Sonnet 5 vs Sonnet 5.5.
Claude Sonnet 5Claude Sonnet 5.5
DESIGN & UI
28 SEP 2026
17CREDITED AUTHORS
07MODELS COMPARED