AI assistant and model comparisons. Only comparisons backed by dated, verifiable sources are published.
What we compare in AI Tools & Models
Where the cited sources state them, comparisons in this category cover:
- Vendor positioning
- Input and output modalities
- Context window (official)
- Maximum output
- Reasoning controls
- Tool use
- Knowledge cutoff
- API price per million tokens (dated)
- Access and availability
Fields that do not apply to a product are left out rather than padded.
Comparisons
AI Tools & Models
Claude Fable 5.1 vs Claude Opus 5.5: Specifications Compared
Claude Fable 5.1 versus Claude Opus 5.5
Top-tier reasoning model versus Opus on latency, price and defaults.
Verdict: Opus for most; Fable when the problem justifies cost and latency.
Read comparisonAI Tools & Models
Claude Opus 5.5 vs Claude Sonnet 5.5: Specifications Compared
Claude Opus 5.5 versus Claude Sonnet 5.5
Context, output, latency, effort defaults and API price from Anthropic's models overview.
Verdict: Same context and output limits; Opus for harder agentic work, Sonnet for speed and price.
Read comparisonAI Tools & Models
GPT-6 Astra vs GPT-6.1 Sol: Specifications Compared
GPT-6 Astra versus GPT-6.1 Sol
OpenAI's two top models compared on price, context and reasoning efforts per OpenAI's models listing.
Verdict: Sol first; step up to Astra only if tests justify five times the price.
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Specifications, availability and prices change. Every comparison shows the date it was checked and its sources.