LLM Comparison

Claude Sonnet 5.5 vs Inflection 3 Pi

Side-by-side specs, pricing & capabilities · Updated September 2026

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2/6 models

Same tier:

	Claude Sonnet 5.5	Inflection 3 Pi
Organization	Anthropic	Inflection AI
OpenTools Score
Family	Claude Sonnet	Inflection
Status	Current	Current
Release Date	Sep 2026	Oct 2024
Context Window	1.0M tokens	8K tokens
Input Price	$2.00/M tokens	$2.50/M tokens
Output Price	$10.00/M tokens	$10.00/M tokens
Pricing Notes	Anthropic Claude API standard tier, USD per million tokens: $2 input, $10 output; 5-minute cache writes $2.50, 1-hour cache writes $4, cache reads $0.20. Batch API gives 50% off input and output. A 300K output limit is available only for Message Batches API with the output-300k-2026-03-24 beta header; standard maximum output is 128K. Provider and regional terms may vary.	—
Capabilities	textvisionreasoningcodingtool-uselong-contextcontext-caching	textcode
Training Cutoff	2026-06	—
Max Output	128K tokens	1K tokens
API Identifier	`claude-sonnet-5-5`	`inflection/inflection-3-pi`
Benchmarks
Artificial Analysis Intelligence Index v4.3.2	55.9779549012591artificial-analysis	—
	View Claude Sonnet 5.5	View Inflection 3 Pi

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Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
Claude Sonnet 5.5Cheapest	$2.00	$5.00	$7.00	—
Inflection 3 Pi	$2.50	$5.00	$7.50	+7%

Anthropic

Claude Sonnet 5.5

Claude Sonnet 5.5 is Anthropic's proprietary adaptive-reasoning model. The Claude API identifier is claude-sonnet-5-5. It accepts text and images, returns text, has a 1,000,000-token context window and a 128,000-token standard output limit. Anthropic lists standard API input and output pricing at $2 and $10 per million tokens.

Inflection AI

Inflection 3 Pi

Inflection 3 Pi is a large language model from Inflection AI. Supports up to 8,000 token context window. Available from $2.50/M input tokens.