Fable 5.2 vs Opus 5.5: The Price Gap Flipped on Hard Tasks

A long Fable run in Claude Code tends to end the same way: great work, then a look at Settings > Usage that shows how much of your week it took. (Fable models eat into plan limits faster than other Claude models.)

Two months ago that cost made the choice easy. Opus 5.5 matched Fable 5.1 at default settings for about a third of the cost per task, and Anthropic itself told people to start with Opus. We covered that round in our Opus 5.5 vs Fable 5.1 comparison.

Then Anthropic shipped Claude Fable 5.2 on November 9, 2026, at 20% lower prices, and its own charts tell a different story. At High effort, Fable 5.2 reaches about the same FrontierCode score as Opus 5.5 at its best, for roughly half the cost per task.

I went line by line through Anthropic's launch post, the Fable 5.2 model page that lists Opus 5.5 beside it, the Claude pricing docs, and the launch-day numbers from Artificial Analysis. Below: the default I'd pick now, the few jobs where the pricier model ends up cheaper, and how far each one goes on a Claude plan.

Claude Fable 5.2 vs Opus 5.5: the short answer

Keep Opus 5.5 as your everyday default, and move hard tasks to Fable 5.2 sooner than you would have with Fable 5.1. Anthropic still calls Opus 5.5 "our strongest daily driver" and tells you to start there for most coding and knowledge work. Our Claude Opus 5.5 explainer covers the rest of that release.

What changed is where "move up" starts paying off. With Fable 5.1, you escalated only after Opus had failed at its highest setting. With 5.2, if a job is making you run Opus at Max, the cheaper path is often to run Fable 5.2 at High instead.

Choose Opus 5.5 if you:

• Want one default for chat, writing, and everyday coding.
• Need zero data retention.
• Run high-volume API traffic where the 2x token price adds up.

Choose Fable 5.2 if you:

• Keep running Opus 5.5 at Xhigh or Max to finish a task.
• Run long migrations, agent sessions, or research where one miss costs more than the tokens.
• Orchestrate smaller models and want a stronger planner on top.
• Are still on Fable 5.1 (5.2 is cheaper and faster).

Opus 5.5 has been out since September 22 and Fable 5.2 arrived November 9, but both sit on the same 1M-token context with the same 128K output cap, so this is a price-and-behavior question more than a feature checklist.

Specs and pricing side by side

Context window, output cap, and knowledge cutoff all match, so the differences come down to price, default effort, and zero data retention.

The spec sheet:

Prices come from Anthropic's Claude pricing docs and the Fable 5.2 model page, read on launch day. Our Claude pricing breakdown tracks the rest of the lineup.

Three things stand out next to the Fable 5.1 round:

• The token gap shrank from 2.5x to 2x. Fable 5.1 cost $10 and $50. Fable 5.2 costs $8 and $40, exactly double Opus 5.5.
• Cache reads now cost the same. Both charge $0.20 per million cached tokens, and Anthropic says cache reads are the bulk of agentic and coding costs, so long sessions narrow the gap.
• Both have fast mode now. Fable 5.1 did not. Fable 5.2 runs up to 2.5x faster output at $16 and $80, double Opus 5.5's fast mode price.

What one agent session costs on each

Per-token prices hide the real gap, so here is a rough session at list rates: 8 million cached tokens read back, 400,000 tokens written to a five-minute cache, and 150,000 tokens of output. Treat these as illustrative figures.

One session, both models:

On identical tokens, Fable 5.2 runs about 1.8x Opus 5.5. With Fable 5.1 that figure was 2.2x, so the gap closed.

That total assumes both models spend the same tokens. In practice they spend different amounts on the same job, which can push Fable's real bill below Opus's or well above it.

What the benchmarks say: each model at its best

Run each model at its best effort and Fable 5.2 leads Opus 5.5 on every shared row except one.

Anthropic's launch benchmarks:

The biggest gaps sit in robotics, remote freelance-style projects, and agentic science. The smallest are computer use and agentic coding on FrontierCode. Knowledge work splits down the middle: Fable wins the AA-Briefcase rubric, and Opus keeps the higher Elo rating (1800 to 1785).

Artificial Analysis, which runs its own independent suite, puts Fable 5.2 ahead on overall intelligence too, scoring it 65 to Opus 5.5's 59 on its Intelligence Index at Max. So the "Fable is the smarter model" read holds up outside Anthropic's own numbers.

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Fable 5.2 vs Opus 5.5 cost at the same score

The cost-per-task charts are what changed the answer. Anthropic set Fable 5.2 at lower effort next to Opus 5.5 at its best, and Fable keeps pace for a fraction of the price.

Same score, different cost:

So if your habit is "Opus at Max for the hard stuff," Anthropic's numbers say that habit is now the expensive one. Fable 5.2 thinks more efficiently per token, and on Medium (the default in the Claude apps and Claude Code) it uses fewer tokens than Fable 5.1 did.

Two cautions before you change your defaults.

First, the cost charts come from Anthropic itself, though Artificial Analysis's independent runs point the same way: Fable 5.2 at High scores 62 on its Intelligence Index to Opus 5.5 at Max's 59, for $9.08 per task against $10.04. Second, run both at Max and the economics invert. Artificial Analysis clocked Fable 5.2 at $26.54 per task against Opus 5.5's $10.04, because Fable writes far more tokens at full effort (274,000 per task to Opus's 173,000) and takes about 48 minutes per task to Opus's 25. The price flip only shows up when you drop Fable's effort to match Opus's best score.

At default settings the two are not even doing the same amount of thinking, since Opus runs Medium and Fable runs High on the API. Test on your own tasks before you trust any single row here.

Where Opus 5.5 still wins

Fable grabs the headlines, but Opus 5.5 holds real ground. These are the reasons to keep it as the default.

1. Price per token. Opus is half the price on input, output, cache writes, and fast mode. For short tasks that don't need deep reasoning, that is the whole argument.
2. Zero data retention. Opus 5.5 offers it. Fable 5.2 uses 30-day retention for safety monitoring unless your organization qualifies for zero retention through Anthropic's Enterprise Frontier Safeguards, which is still in private beta.
3. API compatibility. Both models reject forced tool choice and want temperature, top_p, and top_k left out, so most request code carries over. The difference is the prefix check: Fable 5.2 applies it to every account, while Opus 5.5 applies it by default only to accounts created on or after August 31, 2026. On an older account, code that edits earlier turns between requests can work on Opus and fail on Fable.
4. Knowledge-work Elo. On AA-Briefcase, Opus 5.5 still holds the higher Elo rating, 1800 to Fable's 1785.

Where Fable 5.2 pulls clearly ahead

The flip side is a short list of jobs where Fable 5.2 is worth every extra cent.

Long, ambiguous engineering. Anthropic says a team of agents on an early Fable 5.2 migrated a production service from Python to Rust, and one engineer had it coordinate more than 1,000 subagents across eight days to build a bootable prototype operating system from an empty folder.

Large multi-agent jobs. On formalizing the proof of Fermat's Last Theorem, an early version of Fable 5.2 finished in 30 hours with about 1,000 agents. Opus 5.5 on the same setup reached 26% in 18 hours and barely moved after that.

Orchestrating cheaper models. Anthropic positions Fable 5.2 as an Advisor that smaller models consult, or an Orchestrator that hands simple work down the stack. You pay Fable prices only for the planning, then let a cheaper tier like Sonnet 5.5 do the volume.

Hardware, robotics, and science. Fable 5.2 scores 83.5 on the BenchCAD 2.1 hardware test at Max against Opus 5.5's 65.3, and leads the RoboDojo robotics benchmark by more than 25 points.

How far each goes on your Claude plan

Here's how the two land on each Claude subscription.

• Pro: Opus 5.5 is included. Under the normal rules, Fable runs on pay-as-you-go usage credits.
• Max: Both are included, but Fable can use at most 50% of your weekly limit and drains it faster than other models.
• Team: Premium seats work like Max, standard seats like Pro.
• API and usage-based Enterprise: Both bill per token at the rates above.

Launch week is the exception. Through November 16, 2026, Pro plans and standard Team seats get Fable included for up to 50% of weekly limits. Accounts with paid billing before November 9 also get Fable resets: one on Pro and standard Team seats, and one to three on Max, Ultra, and premium Team seats, depending on how long they've subscribed. Those Max, Ultra, and premium resets last until March 8, 2027, so check Settings > Usage if you're on one of those plans. If you are still weighing subscriptions, our Claude vs ChatGPT plan comparison lays the tiers out.

Fable 5.2 vs Opus 5.5 for coding in Claude Code

For most developers the choice happens inside Claude Code, Anthropic's terminal AI coding agent. Type /model to switch mid-session, or start with claude --model claude-opus-5-5 or claude --model claude-fable-5-2. Fable 5.2 fast mode works in Claude Code, and the default effort there is Medium. Higher effort burns through your limit faster, so Low and Medium stretch routine work further.

Which should you choose, and how to split work between them

You don't have to pick one model for everything.

The quick version by job:

A simple way to run it:

1. Default to Opus 5.5 at Medium or High.
2. Escalate to Fable 5.2 at High, not Opus at Max. If a task fails at Opus High, Anthropic's charts say Fable High is the better next step.
3. Measure for a week. Keep a short list of tasks, run them both ways, and check Settings > Usage.

The Fable 5.2 vs Opus 5.5 answer is still a default and an exception. The only thing that changed is where the exception starts: Fable 5.2 at High is now the move the moment you would once have pushed Opus to Max.

Keep one assistant, pick the model per job

Matching the model to the job is a habit worth keeping anywhere you use AI, and it's easier when switching models doesn't mean rebuilding your setup each time.

If your team works in Slack, Lindy is an AI teammate that lets you choose the model for each task. You can send routine work to a cheaper model and save the heavy jobs for a stronger one, all from the same assistant. And if Claude's limits or pricing still do not fit, there are solid Claude alternatives worth a look.

Want to put it to work? Try Lindy free and point it at the busywork you'd rather not babysit.

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Frequently asked questions

Is Fable 5.2 better than Opus 5.5?

Yes, Fable 5.2 beats Opus 5.5 on almost every Anthropic launch benchmark, including FrontierSWE v2 (69.9% vs 62.3%) and Humanity's Last Exam (74.2% vs 67.7%), and it leads Artificial Analysis's Intelligence Index 65 to 59. Opus keeps a slightly higher AA-Briefcase Elo (1800 vs 1785) and costs half as much per token.

Is Opus 5.5 cheaper than Fable 5.2?

Per token, yes. Opus 5.5 costs $4 and $20 per million input and output tokens against $8 and $40 for Fable 5.2, and cache reads tie at $0.20. Per task, it depends on effort. Anthropic's charts show Fable 5.2 at High reaching Opus 5.5's best FrontierCode score for about half the cost, but with both at Max, Artificial Analysis puts Fable at $26.54 per task to Opus's $10.04.

Should I switch from Opus 5.5 to Fable 5.2?

Not for everything. Anthropic still recommends Opus 5.5 as the starting point for most coding and knowledge work. Switch the tasks you would otherwise run on Opus at Xhigh or Max, plus long agent runs and migrations.

Is Fable 5.2 faster than Opus 5.5?

About the same on paper, since Anthropic labels both "Moderate" latency. Fable 5.2 outputs up to 30% faster than Fable 5.1, and both offer fast mode at up to 2.5x faster output. At full Max effort, Artificial Analysis clocked Opus slower to its first token but quicker to finish a whole task.

Is Fable 5.2 High better than Opus 5.5 Max?

On FrontierCode 2.0 they come out about level, with Fable 5.2 at High scoring 45.3% to Opus 5.5 at Max scoring 45.5%, and Fable gets there for roughly half the cost per task. Artificial Analysis's independent runs agree: Fable 5.2 at High scores 62 on its Intelligence Index to Opus 5.5 at Max's 59, at $9.08 per task against $10.04.

Can I use Fable 5.2 on Claude Pro?

Yes, on usage credits. On Pro, Fable runs on pay-as-you-go usage credits outside your plan's limits, so check your plan before you lean on it. Through November 16, 2026, Anthropic also includes Fable for up to 50% of weekly usage limits on Pro plans and standard Team seats.