I Tested Opus 5.5 vs Fable 5.1 on 7 Real Use Cases (Not Even Close)

Summary
Ben from Ben AI tests and benchmarks Anthropic’s newly released Claude Opus 5.5 against Claude Fable 5.1 across seven hands-on business and creator workflows. He compares speed, token consumption, cost, and qualitative output for slide generation, landing page design, video competitor research, customer case study analysis, video-to-document conversion, customer data analytics, and large-context knowledge retrieval.

What is shown

• [00:00] Anthropic release page for Claude Opus 5.5 (dated September 22, 2026) alongside official benchmark tables and pricing comparisons.
• [00:29] Test 1: Marketing deck creation — Prompt requesting 30-day performance slides with charts; comparison of generated slide formatting, data layout, and copy.
• [02:10] Test 2: Landing page redesign — Redesigning the landing page for app "Baalda" with reference styles, liquid glass effects, and scroll animations using Higgsfield.
• [04:22] Test 3: YouTube competitor research — Analyzing recent YouTube videos on Jev to identify outlier thumbnails, titles, and pre-outlines; Fable scanned 50 videos while Opus 5.5 analyzed 168 (including 59 non-English videos).
• [05:44] Test 4: Customer story research — Pulling 15 adoption strategies and quotes from Anthropic’s case study library; Opus 5.5 utilized sub-agents running Sonnet 5.5.
• [08:09] Test 5: Video-to-document conversion — Transcribing and screenshotting a YouTube video into a formatted Google Doc lesson with labeled callout arrows.
• [10:08] Test 6: Customer intelligence report — Synthesizing customer calls, Q&A transcripts, and community tickets into product upgrade recommendations; Fable 5.1 processed 556 calls while Opus 5.5 processed 248.
• [13:24] Test 7: Business trajectory review — Second-brain knowledge vault retrieval; Fable 5.1 parsed 199 files over 17 minutes compared to Opus 5.5's 50 files over 4 minutes 47 seconds.
• [15:17] Summary scorecard comparing output quality, runtime, and API costs between both models across all tests.

Claims & numbers

• Anthropic released Claude Opus 5.5 on September 22, 2026 (the presenter shows on screen [00:00]).
• Per 1M tokens, the presenter shows Opus 5.5 costs $0.20 for cache reads, $4 for input tokens, $20 for output tokens, and $5 for cache writes, compared to Opus 5 at $0.50, $5, $25, and $6.25 respectively [00:07].
• Marketing deck: Opus 5.5 took 22m 22s, used 29.8M tokens, and cost $11.78; Fable 5.1 took 21m 13s, used 19.5M tokens, and cost $21.34 [01:51].
• Landing page redesign: Opus 5.5 took 17m 48s, used 13.4M tokens, and cost $7.47; Fable 5.1 took 14m 23s, used 5.4M tokens, and cost $12.01 [04:03].
• Video research: Opus 5.5 took 15m 57s, used 17.5M tokens, and cost $20.67; Fable 5.1 took 14m 28s, used 7.9M tokens, and cost $14.02 [05:27].
• Case study research: Opus 5.5 took 13m 03s, used 4.7M tokens, and cost $7.01; Fable 5.1 took 20m 08s, used 853k tokens, and cost $15.01 [06:58].
• Video-to-document conversion: Opus 5.5 took 14m 38s, used 13.1M tokens, and cost $5.88; Fable 5.1 took 19m 32s, used 9.5M tokens, and cost $10.39 [09:58].
• Customer analytics report: Fable 5.1 took 1h 13m, used 33.0M tokens, and cost $100.55; Opus 5.5 took 39m 24s, used 7.6M tokens, and cost $62.92 [12:24].
• Business trajectory review: Opus 5.5 took 4m 47s, used 3.1M tokens, and cost $1.92; Fable 5.1 took 17m 03s, used 5.5M tokens, and cost $17.07 [14:58].

Notable quotes

• [00:06] "It costs less per token than Opus 5 and uses fewer tokens per task, which nets out to a 40% drop in costs."
• [02:05] "Opus actually used 30 million tokens instead of 20 million versus Fable... but it was still half the cost of what Fable cost me."
• [14:50] "When there's a lot of context involved, it seems Fable goes deeper, but of course there is a significant difference in the cost."

Assessment
This is an independent user review and comparative evaluation featuring genuine software agent runs and side-by-side artifact reviews. The comparisons demonstrate actual execution outputs, runtimes, and token costs across realistic user tasks, though the author acknowledges that Fable 5.1 outperformed Opus 5.5 on context-heavy data synthesis tasks.

Described by gemini-3.8-flash on 2026-09-29 from the video's audio and frames.