GPT-5.6 Sol vs Claude Fable 5 vs Gemini 3.7 Flash
A source-backed comparison of premium reasoning and coding positioning, multimodal input breadth, context limits, and current API economics.
There is no defensible universal winner. The strongest choice changes with capability priorities, provider ecosystem, modality needs, and token economics.
OpenAI positions Sol as its flagship for complex professional work, reasoning, and coding. This is a published-positioning pick, not an AI World Scope benchmark result.
View GPT-5.6 SolAt the current stored standard rates, Gemini 3.7 Flash has the lowest direct input and output token prices of the three.
View Gemini 3.7 FlashIts current verified record includes text, image, video, audio, and PDF input, broader than the text-and-image input stored for Sol and Fable 5.
View Gemini 3.7 FlashAt a Glance
Detailed Comparison Matrix
| Feature | OpenAI GPT-5.6 Sol | Anthropic Claude Fable 5 | Google Gemini 3.7 Flash |
|---|---|---|---|
| Provider | OpenAI | Anthropic | |
| Category & Status | Reasoning & Multimodal · Active | Reasoning & Multimodal · Active | Fast Multimodal · Active |
| Release Date | Jul 9, 2026 | Jun 9, 2026 | Aug 13, 2026 |
| Context Window | 1.05M tokens | 1M tokens | 1,048,576 tokens |
| Maximum Output | 128K tokens | 128K tokens | 65,536 tokens |
| Input Price / 1M | $4.00 | $10.00 | $0.75 |
| Cached Input / 1M | $0.40 | $1.00 | $0.07 |
| Output Price / 1M | $20.00 | $50.00 | $3.75 |
| Long-Context Pricing | From 272,000 tokens · $8.00 input · $30.00 output | No separate tier stored | No separate tier stored |
| Pricing Conditions | Long-context tier from 272,000 tokens | No special condition stored | Published rate through Dec 31, 2026 |
| Input Modalities | text, image | text, image | text, image, video, audio, PDF |
| Core Capabilities | Reasoning · Vision · API | Reasoning · Vision · API | Reasoning · Vision · Audio · Video · API |
| API Availability | Available | Available | Available |
| Provider API Model ID | gpt-5.6-sol | claude-fable-5 | gemini-3.7-flash |
| Facts Verified | Aug 25, 2026 | Aug 25, 2026 | Aug 25, 2026 |
Winner by Use Case
OpenAI's current official positioning explicitly emphasizes complex professional work, reasoning, and coding for Sol.
Its current standard input and output token rates are the lowest of the three in the verified catalog records.
The current record supports text, image, video, audio, and PDF input, giving it the widest verified input-modality set in this matchup.
Fable 5 is Anthropic's most capable widely released model, making it the natural choice when Anthropic ecosystem compatibility is a selection requirement.
All three sit in roughly the 1M-token context class. The numerical differences are too small by themselves to justify a universal workload winner.
Pricing & Token Economics
Example uses 1M standard input tokens + 1M output tokens. It excludes caching, long-context, storage, batch, regional and other special pricing conditions.
What We Think
Capability-first default
If premium reasoning and coding positioning matter more than minimizing token cost, Sol is the cleanest default in this trio. Its case is strongest for demanding professional workloads, while its current standard token pricing is materially above Gemini 3.7 Flash.
Choose it for Anthropic fit, not price
Fable 5 is Anthropic's highest-capability widely released Claude model. It is also the most expensive of these three at the current stored standard token rates, so its strongest case is Anthropic ecosystem compatibility rather than cost minimization.
Economics and multimodality stand out
Flash differentiates itself here through current token economics and input breadth. Its verified text, image, video, audio, and PDF inputs make it particularly attractive for high-volume multimodal pipelines where cost is a major constraint.
Methodology & Sources
AI World Scope resolves context windows, output limits, pricing, modalities, status, API availability, and verification dates from the current canonical model records at render time. Comparison-specific winners are qualitative editorial judgments based on those verified fields plus official provider positioning. We do not assign a normalized benchmark winner because we do not currently have a cross-vendor benchmark set for these three models under identical methodology. Pricing is shown in the provider-published currency and pricing tier stored in the catalog, with regional, promotional, cached, and long-context conditions retained where available.
Vendor positioning is not treated as independent AI World Scope performance testing.
No synthetic AI World Scope overall score or fabricated benchmark score is used on this comparison.
Pricing and availability can change quickly; re-check current provider documentation before major purchasing decisions.
Key Takeaways
Choose GPT-5.6 Sol when premium coding and reasoning positioning matters more than minimizing token cost.
Choose Gemini 3.7 Flash when current API economics and broad multimodal input support are the primary decision factors.
Choose Claude Fable 5 when you specifically want Anthropic's highest-capability widely released model and Anthropic ecosystem fit justifies the higher current token price.
Do not treat the roughly 1M-token context windows as a decisive differentiator by themselves; all three are in the same broad long-context class.
There is no normalized AI World Scope benchmark winner on this page because comparable cross-vendor testing has not been performed.