API cost decision in 10 seconds

GPT-5.6 Terra vs Aion-3.0

Pick Aion-3.0 for lower cost; pick GPT-5.6 Terra only if the larger context window matters more.

Page updated: 2026-08-17T15:08:04Z Data confirmed: 2026-08-23T11:07:50Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Aion-3.0 for lower cost; pick GPT-5.6 Terra only if the larger context window matters more.

On the standard 1M input plus 500K output workload, Aion-3.0 is estimated at $6 vs $8 for GPT-5.6 Terra, saving $2 (25% lower).

Cost-first pickAion-3.0

Context-first pickGPT-5.6 Terra

Sample savings$225%

10x traffic gap$20

GPT-5.6 Terra has more context, but Aion-3.0 saves $2 on the standard workload. At 10x that traffic, the same price gap is about $20. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

Cost winner changes by workload shape: input-heavy / RAG favors GPT-5.6 Terra, balanced workload favors Aion-3.0, and output-heavy chatbot favors Aion-3.0.

Workload shape	Token mix	Better pick	GPT-5.6 Terra	Aion-3.0
Input-heavy / RAG	5M input + 500K output	GPT-5.6 Terra	$16	$18
Balanced workload	1M input + 1M output	Aion-3.0	$14	$9
Output-heavy chatbot	1M input + 5M output	Aion-3.0	$62	$33

Cheaper input GPT-5.6 Terra $2 vs $3 / 1M

GPT-5.6 Terra is $1 cheaper per 1M input tokens (33.3% lower; 1.5x difference).

Cheaper output Aion-3.0 $12 vs $6 / 1M

Aion-3.0 is $6 cheaper per 1M output tokens (50% lower; 2x difference).

Larger context GPT-5.6 Terra 1.05M vs 131.07K

GPT-5.6 Terra has 918.93K more context (8.01x larger).

Sample workload Aion-3.0 $8 vs $6

Aion-3.0 is $2 cheaper on the standard workload (25% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

GPT-5.6 Terra Calculating… Estimated API cost

Aion-3.0 Calculating… Estimated API cost

Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

GPT-5.6 Terra has the lower input price; Aion-3.0 has the lower output price; GPT-5.6 Terra offers the larger context window. For the 1M input plus 500K output sample, Aion-3.0 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $8 for GPT-5.6 Terra and $6 for Aion-3.0.

Best Fit

Choose GPT-5.6 Terra when you care most about lower input-token price, and larger context window.

Choose Aion-3.0 when you care most about lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Aion-3.0 is estimated at $6 vs $8 for GPT-5.6 Terra, saving $2 (25% lower).
Aion-3.0 is $2 cheaper on the standard workload (25% lower).
GPT-5.6 Terra is $1 cheaper per 1M input tokens (33.3% lower; 1.5x difference).
Aion-3.0 is $6 cheaper per 1M output tokens (50% lower; 2x difference).
GPT-5.6 Terra has 918.93K more context (8.01x larger).

Head-to-Head Specs

Feature	GPT-5.6 Terra (OpenAI)	Aion-3.0 (AionLabs)
Input Price prompt tokens per 1M	$2	$3
Completion Price per 1M tokens	$12	$6
Sample Workload Cost 1M input + 500K output	$8	$6
Context Window	1.05M	131.07K
Release Date	2026-07-09	2026-07-07

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Aion-3.0	On the standard 1M input plus 500K output workload, Aion-3.0 is estimated at $6 vs $8 for GPT-5.6 Terra, saving $2 (25% lower).
High-volume input processing	GPT-5.6 Terra	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Aion-3.0	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.6 Terra	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

gpt-oss-120b (free) can replace GPT-5.6 Terra when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.6 Terra when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.6 Terra when lower sample workload cost matters most: $0.1.
gpt-oss-120b can replace GPT-5.6 Terra when lower sample workload cost matters most: $0.12.

Larger context near this budget

Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
Grok 4.20 offers 2M context with $2.5 sample workload cost.
DeepSeek V4 Flash 0731 offers 1.31M context with $0.17 sample workload cost.
DeepSeek V4 Flash Latest offers 1.31M context with $0.11 sample workload cost.

Popular competitors

DeepSeek V4 Flash 0731 · DeepSeek · #1
MiMo-V2.5 · Xiaomi · #2
Hy3 · Tencent · #3
Ox Alpha · stealth · #4

Cheaper alternatives

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Larger context alternatives

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Provider catalogs

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OpenAI catalog

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AionLabs catalog

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Open AionLabs models

GPT-5.6 Terra

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...

Aion-3.0

Aion-3.0 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It uses a collaborative generation process in which multiple specialized models each contribute...