GPT-5.6 Sol vs. Claude Fable 5: Benchmarks, Pricing & Palms-On

GPT-5.6 Sol and Claude Fable 5 are at present combating for the frontier-model crown.

Fable 5 holds a slight edge normally intelligence, whereas Sol hits again with stronger coding efficiency, sooner execution and far decrease pricing. In reality, GPT-5.6 Sol is priced nearer to Claude Opus 4.8 than to Fable 5, which makes this comparability much more fascinating.

One mannequin guarantees deeper reasoning. The opposite provides near-frontier efficiency at a much more sensible value.

So, which mannequin must you truly use?

What’s GPT-5.6 Sol?

GPT-5.6 Sol is OpenAI’s flagship mannequin for coding, analysis, software use and complicated skilled workflows.

For harder issues, it helps max reasoning, permitting the mannequin to spend extra compute earlier than answering. Its extremely mode goes a step additional by deploying a number of brokers in parallel, making it higher suited to massive coding duties, deep analysis and multi-step tasks.

Learn extra: GPT-5.6: Sol, Terra, and Luna

What’s Claude Fable 5?

Claude Fable 5 is Anthropic’s most succesful publicly out there mannequin, constructed for advanced reasoning and long-running agentic work.

Inside Claude Code or Managed Brokers, it will possibly plan multi-step duties, delegate work to sub-agents, evaluate intermediate outcomes and refine its personal output. That makes it particularly helpful for big coding tasks, deep analysis and assignments that require much less human supervision.

Learn extra: Fable 5: Fantasy(os) or Actuality

Pricing Comparability

API costs per million tokens:

Sol prices half as a lot for enter and 40% much less for output.

Each fashions supply roughly a million tokens of context and as much as 128,000 output tokens. Sol’s context window is barely bigger at 1.05 million tokens.

There may be one catch. Sol requests crossing 272,000 enter tokens obtain greater pricing for all the request.

Pricing winner: GPT-5.6 Sol

For regular workloads, it’s not shut. Not solely Sol has the next restrict but additionally provides free to make use of token resets sometimes: 

One thing that Anthropic can clearly be taught!

Palms-On Comparability

To check GPT-5.6 Sol and Claude Fable 5 pretty, I used the identical immediate, recent chats and default reasoning settings for each fashions.

The outputs have been judged on instruction following, correctness, completeness and presentation.

Take a look at 1: Construct a Internet Software

This take a look at checks frontend coding, design high quality and useful completeness.

Immediate:

Construct a responsive private finance dashboard as a single HTML file.
Necessities:
- Use solely HTML, CSS and vanilla JavaScript
- Embrace playing cards for revenue, bills, financial savings and investments
- Add an interactive month-to-month spending chart
- Add a transaction desk with search and class filters
- Embrace gentle and darkish modes
- Use life like pattern knowledge
- Make the design clear and appropriate for a contemporary fintech product
- Return the entire working code in a single file

GPT 5.6 Sol Response:

It took the mannequin 6 minutes and 30 seconds to reply with the specified webpage. Right here it’s:

Claude Fable 5 Response:

It took the mannequin 3 minutes and 10 seconds to reply with the specified webpage. Right here it’s:

Take a look at 2: Information Evaluation and Enterprise Reasoning

This take a look at checks analytical depth, numerical accuracy and the flexibility to supply helpful suggestions.

Immediate:

You're a senior knowledge analyst reviewing the quarterly efficiency of an e-commerce firm.
Quarterly knowledge:
Q1:
Income: $2.4 million
Orders: 48,000
Conversion fee: 2.8%
Buyer acquisition value: $31
Repeat buy fee: 22%
Q2:
Income: $2.7 million
Orders: 51,000
Conversion fee: 3.1%
Buyer acquisition value: $36
Repeat buy fee: 24%
Q3:
Income: $2.9 million
Orders: 54,000
Conversion fee: 3.4%
Buyer acquisition value: $43
Repeat buy fee: 23%
This fall:
Income: $3.1 million
Orders: 56,000
Conversion fee: 3.3%
Buyer acquisition value: $51
Repeat buy fee: 20%
Analyse the corporate’s efficiency.
Embrace:
- The three most vital tendencies
- Any warning indicators
- Probably causes behind the modifications
- 5 actions the corporate ought to take subsequent quarter
- A concise govt abstract
Don't merely repeat the numbers. Derive helpful enterprise insights from them.

GPT 5.6 Sol Response:

The mannequin took 1 minute and 20 seconds to reply with: 

Click on right here to view the complete response

Claude Fable 5 Response:

The mannequin took a minute to reply with:

Click on right here to view the complete response

Take a look at 3: Presentation Creation

This take a look at checks content material construction, visible judgement and the standard {of professional} deliverables.

Immediate:

Create an eight-slide investor presentation for an AI-powered recruitment platform.
The platform:
- Screens job functions
- Matches candidates with appropriate roles
- Generates structured interview questions
- Supplies hiring analytics
- Targets mid-sized know-how firms
Embrace:
1. Title slide
2. Downside
3. Answer
4. Product workflow
5. Market alternative
6. Enterprise mannequin
7. Aggressive benefit
8. Closing slide
Use life like pattern numbers the place required.

GPT 5.6 Sol Response:

It took Sol 4 minutes and 38 seconds to answer the question with: 

Claude Fable 5 Response:

It took Fable 5, 2 minutes and 30 seconds to answer the question with:

Verdict

The most important distinction between the 2 needs to be the utilization limits. GPT 5.6 Sol by no means ran out of utilization, no matter how lengthy I had used it for. Claude Fable 5 however, hog’d by the utilization restrict. 3-4 conversations and I used to be greeted with: 

Contemplating the truth that Fable 5 is offered until 19 July whereas Sol is there completely for all of the paid customers and that the pricing of Fable 5 is 2-3 occasions. But it surely does take its time. I imply a lot of time!

On a median it took sol twice the time it took Fable 5 for responding to the identical question (with comparable response high quality). 

GPT-5.6 Sol vs Claude Fable 5: Benchmarks

Claude Fable 5 has a slim edge normally intelligence, however GPT-5.6 Sol is the stronger coding agent.

The headline outcomes are cut up. Fable leads the Synthetic Evaluation Intelligence Index by one level, whereas Sol holds a three-point benefit on the Coding Agent Index. For normal reasoning, the fashions are successfully neck and neck. For sensible software-development work, Sol has the clearer lead.

Sol wins extra coding evaluations

Sol leads on DeepSWE and Terminal-Bench v2, whereas Fable finishes one level forward on SWE-Atlas-QnA. Successful two of the three particular person evaluations provides Sol the stronger general coding-agent profile.

Higher efficiency at a decrease value

Sol’s common analysis value is $7.08 per process, in contrast with $11.80 for Fable 5. That makes Sol roughly 40% cheaper, strengthening its benefit for groups working coding brokers at scale.

Fable analyzes higher however Sol presents higher

AA-Briefcase exhibits a extra nuanced end result. Fable earns the upper general Elo rating and leads clearly in analytical high quality. Sol, nonetheless, scores considerably greater on presentation, suggesting it’s higher at turning its work into clear, usable outputs.

Conclusion

Right here’s what turned clear:

• GPT-5.6 Sol is slower however cheaper.
• Claude Fable 5 is healthier at lengthy, advanced assignments.
• Sol responds effectively to suggestions and iteration.
• Fable requires much less supervision as soon as the duty is outlined.

For many customers, GPT-5.6 Sol is the higher alternative. It comes near Fable’s intelligence whereas providing higher coding efficiency at a a lot decrease value. 

Select Claude Fable 5 when the work is advanced sufficient to justify the additional expense, particularly once you need to hand over a undertaking and return later.

The only method to put it:

Sol is the mannequin you’re employed with. Fable is the mannequin you hand work to.

Ceaselessly Requested Questions

I focus on reviewing and refining AI-driven analysis, technical documentation, and content material associated to rising AI applied sciences. My expertise spans AI mannequin coaching, knowledge evaluation, and knowledge retrieval, permitting me to craft content material that’s each technically correct and accessible.