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Compare AI APIs & Find the Cheapest Path

Model matchups, cheaper alternatives, and setup guides — pick the right model for your workload and your budget.

Latest models & hot topics

Claude Fable 5 API
Anthropic's most capable model — specs, $10/$50 pricing, cheaper paths.
GPT-5.6 (Sol) API
OpenAI's June 2026 flagship — access, variants, what to use now.
GPT-5.6 vs Claude Fable 5
The frontier model clash, and the cheaper third option.

Cheaper alternatives

Claude API Alternative
Same Anthropic models, up to 80% off official pricing.
OpenAI API Alternative
GPT-5 plus Claude on one key, no vendor lock-in.
Cheap Claude Opus API
Opus 4.6 at $3.00/1M input instead of $15.00.
Cheap Claude Sonnet API
Sonnet 4.6 at $0.60/1M — the best-value Claude model.

Set up your tools

Claude API for Cursor
Point Cursor at KissAPI and cut your bill up to 80%.
Claude API for Cline
Run the Cline VS Code agent for a fraction of the cost.
API for Claude Code
Route Claude Code through KissAPI with two env vars.
Claude API for Roo Code
Wire Roo Code to the real Claude models, cheaper.

Model matchups

Opus 4.6 vs Sonnet 4.6
Which Claude model to actually use.
Sonnet 4.6 vs Haiku 4.5
Speed and price versus reasoning.
Sonnet 4.6 vs GPT-5
Claude versus OpenAI's flagship.
Opus 4.6 vs GPT-5.5
Top-tier reasoning head to head.
GPT-5 vs GPT-5.5
Which OpenAI model fits your budget.
API Cost Calculator
Plug in your token volume and compare cost.