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Models › aion-labs › AionLabs: Aion 3.5

AionLabs: Aion 3.5 — pricing & benchmarks

By aion-labs · Updated 2026-07-24 · step-by-step reasoning

AionLabs: Aion 3.5 costs $3 per 1M input tokens and $6 per 1M output tokens, with a 262K context window. It is best suited for step-by-step reasoning, and is available through one OpenAI-compatible Appmo API key.
$3Input / 1M
$6Output / 1M
262KContext
—Intelligence
—Coding
—GPQA %
—Speed tok/s

What AionLabs: Aion 3.5 is used for

AionLabs: Aion 3.5 is best suited for step-by-step reasoning. Access it through one Appmo API key alongside 451 other models — Appmo's optimizer can route to it automatically when it is the best value for a request.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"aion-labs/aion-3.5","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does AionLabs: Aion 3.5 cost?
AionLabs: Aion 3.5 costs $3 per 1M input tokens and $6 per 1M output tokens ($3.75 blended), as of 2026-07-24. Prices are expected to fall as competition increases.

What is AionLabs: Aion 3.5 best for?
AionLabs: Aion 3.5 is best suited for step-by-step reasoning.

How do I use AionLabs: Aion 3.5?
Send requests to Appmo's OpenAI-compatible endpoint with model id "aion-labs/aion-3.5" and one API key — no separate provider account needed.