GPT-5.6 Sol and Claude Fable 5 are at present preventing for the frontier-model crown.
Fable 5 holds a slight edge generally 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 attention-grabbing.
One mannequin guarantees deeper reasoning. The opposite affords 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, device use and sophisticated 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 initiatives.
Learn extra: GPT-5.6: Sol, Terra, and Luna
What’s Claude Fable 5?
Claude Fable 5 is Anthropic’s most succesful publicly accessible mannequin, constructed for complicated reasoning and long-running agentic work.
Inside Claude Code or Managed Brokers, it could plan multi-step duties, delegate work to sub-agents, evaluation intermediate outcomes and refine its personal output. That makes it particularly helpful for big coding initiatives, deep analysis and assignments that require much less human supervision.
Learn extra: Fable 5: Fable(os) or Actuality
Pricing Comparability
API costs per million tokens:
| Mannequin | Enter | Cached Enter | Output |
|---|---|---|---|
| GPT-5.6 Sol | $5 | $0.50 | $30 |
| Claude Fable 5 | $10 | $1 | $50 |
Sol prices half as a lot for enter and 40% much less for output.
Each fashions provide 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 your complete request.
Pricing winner: GPT-5.6 Sol
For regular workloads, it’s not shut. Not solely Sol has a better restrict but additionally affords free to make use of token resets often:
One thing that Anthropic can clearly study!
Palms-On Comparability
To match GPT-5.6 Sol and Claude Fable 5 pretty, I used the identical immediate, contemporary chats and default reasoning settings for each fashions.
The outputs have been judged on instruction following, correctness, completeness and presentation.
Check 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
- Embody playing cards for earnings, bills, financial savings and investments
- Add an interactive month-to-month spending chart
- Add a transaction desk with search and class filters
- Embody gentle and darkish modes
- Use reasonable pattern information
- 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:
Check 2: Knowledge Evaluation and Enterprise Reasoning
This take a look at checks analytical depth, numerical accuracy and the power to provide helpful suggestions.
Immediate:
You're a senior information analyst reviewing the quarterly efficiency of an e-commerce firm.Quarterly information:
Q1:
Income: $2.4 million
Orders: 48,000
Conversion charge: 2.8%
Buyer acquisition value: $31
Repeat buy charge: 22%Q2:
Income: $2.7 million
Orders: 51,000
Conversion charge: 3.1%
Buyer acquisition value: $36
Repeat buy charge: 24%Q3:
Income: $2.9 million
Orders: 54,000
Conversion charge: 3.4%
Buyer acquisition value: $43
Repeat buy charge: 23%This autumn:
Income: $3.1 million
Orders: 56,000
Conversion charge: 3.3%
Buyer acquisition value: $51
Repeat buy charge: 20%
Analyse the corporate’s efficiency.Embody:
- The three most necessary traits
- Any warning indicators
- Possible causes behind the adjustments
- 5 actions the corporate ought to take subsequent quarter
- A concise govt abstractDon'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
Check 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 purposes
- Matches candidates with appropriate roles
- Generates structured interview questions
- Gives hiring analytics
- Targets mid-sized expertise corporationsEmbody:
1. Title slide
2. Drawback
3. Answer
4. Product workflow
5. Market alternative
6. Enterprise mannequin
7. Aggressive benefit
8. Closing slideUse reasonable pattern numbers the place required.
GPT 5.6 Sol Response:
It took Sol 4 minutes and 38 seconds to reply to the question with:
Claude Fable 5 Response:
It took Fable 5, 2 minutes and 30 seconds to reply to 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 alternatively, hog’d via 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 instances. But it surely does take its time. I imply a lot of time!
On a mean 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 slender edge generally 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 common 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 activity, in contrast with $11.80 for Fable 5. That makes Sol roughly 40% cheaper, strengthening its benefit for groups operating coding brokers at scale.
Fable analyzes higher however Sol presents higher
AA-Briefcase exhibits a extra nuanced consequence. Fable earns the upper general Elo rating and leads clearly in analytical high quality. Sol, nevertheless, scores considerably greater on presentation, suggesting it’s higher at turning its work into clear, usable outputs.
Conclusion
Right here’s what grew to become clear:
- GPT-5.6 Sol is slower however cheaper.
- Claude Fable 5 is best at lengthy, complicated 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 selection. 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 complicated sufficient to justify the additional expense, particularly if you wish to hand over a undertaking and return later.
The only strategy to put it:
Sol is the mannequin you’re employed with. Fable is the mannequin you hand work to.
Often Requested Questions
GPT-5.6 Sol is best for coding, velocity and price. Fable 5 is best for complicated, long-running initiatives requiring higher autonomy.
GPT-5.6 Sol. It prices $5 per million enter tokens and $30 per million output tokens, in contrast with Fable 5’s $10 and $50.
GPT-5.6 Sol at present leads main unbiased coding-agent benchmarks. Fable 5 stays helpful for planning, structure and reviewing complicated implementations.
I specialise in reviewing and refining AI-driven analysis, technical documentation, and content material associated to rising AI applied sciences. My expertise spans AI mannequin coaching, information evaluation, and knowledge retrieval, permitting me to craft content material that’s each technically correct and accessible.
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