API cost decision in 10 seconds

NewPareto 26.9 vs Aion 3.5

Pick Aion 3.5 when budget is the priority.

Page updated: 2026-10-14T04:07:47Z Data confirmed: 2026-10-15T02:07:54Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick Aion 3.5 when budget is the priority.

On the standard 1M input plus 500K output workload, Aion 3.5 is estimated at $6 vs $6.25 for Pareto 26.9, saving $0.25 (4% lower).

Cost-first pickAion 3.5

Context-first pickBoth models

Sample savings$0.254%

10x traffic gap$2.5

The reported context window is tied, so cost and provider fit carry more weight. At 10x that traffic, the same price gap is about $2.5. 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 Pareto 26.9, balanced workload favors Aion 3.5, and output-heavy chatbot favors Aion 3.5.

Workload shape	Token mix	Better pick	Pareto 26.9	Aion 3.5
Input-heavy / RAG	5M input + 500K output	Pareto 26.9	$16.25	$18
Balanced workload	1M input + 1M output	Aion 3.5	$10	$9
Output-heavy chatbot	1M input + 5M output	Aion 3.5	$40	$33

Cheaper input Pareto 26.9 $2.5 vs $3 / 1M

Pareto 26.9 is $0.5 cheaper per 1M input tokens (16.7% lower; 1.2x difference).

Cheaper output Aion 3.5 $7.5 vs $6 / 1M

Aion 3.5 is $1.5 cheaper per 1M output tokens (20% lower; 1.25x difference).

Larger context Tie 262.14K vs 262.14K

Both models report the same context window at 262.14K tokens.

Sample workload Aion 3.5 $6.25 vs $6

Aion 3.5 is $0.25 cheaper on the standard workload (4% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Pareto 26.9 Calculating… Estimated API cost

Aion 3.5 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

Pareto 26.9 has the lower input price; Aion 3.5 has the lower output price; both models report the same context window. For the 1M input plus 500K output sample, Aion 3.5 is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $6.25 for Pareto 26.9 and $6 for Aion 3.5.

Best Fit

Choose Pareto 26.9 when you care most about lower input-token price.

Choose Aion 3.5 when you care most about lower output-token price.

Decision Notes

On the standard 1M input plus 500K output workload, Aion 3.5 is estimated at $6 vs $6.25 for Pareto 26.9, saving $0.25 (4% lower).
Aion 3.5 is $0.25 cheaper on the standard workload (4% lower).
Pareto 26.9 is $0.5 cheaper per 1M input tokens (16.7% lower; 1.2x difference).
Aion 3.5 is $1.5 cheaper per 1M output tokens (20% lower; 1.25x difference).
Both models report the same context window at 262.14K tokens.

Head-to-Head Specs

Feature	NewPareto 26.9 (unbiased)	Aion 3.5 (AionLabs)
Input Price prompt tokens per 1M	$2.5	$3
Completion Price per 1M tokens	$7.5	$6
Sample Workload Cost 1M input + 500K output	$6.25	$6
Context Window	262.14K	262.14K
Release Date	2026-10-13	2026-09-23

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	Aion 3.5	On the standard 1M input plus 500K output workload, Aion 3.5 is estimated at $6 vs $6.25 for Pareto 26.9, saving $0.25 (4% lower).
High-volume input processing	Pareto 26.9	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Aion 3.5	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	Tie	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Pareto 26.10 Preview can replace Pareto 26.9 when lower sample workload cost matters most: $2.4.
Aion 3.5 Mini can replace Aion 3.5 when lower sample workload cost matters most: $1.4.
Aion-3.0-Mini can replace Aion 3.5 when lower sample workload cost matters most: $1.4.
Aion-1.0-Mini can replace Aion 3.5 when lower sample workload cost matters most: $1.4.

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.
Llama 4 Scout offers 1.31M context with $0.47 sample workload cost.
MiMo-V2.6-Flash offers 1.05M context with $0.28 sample workload cost.

Popular competitors

DeepSeek V4.1 Flash · DeepSeek · #1
Step 5 Preview · StepFun · #2
GLM 5.3 Flash · Z.ai · #3
MiMo-V2.6-Flash · Xiaomi · #4

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

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Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

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Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

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unbiased catalog

Review all tracked unbiased models before deciding whether this matchup is the right shortlist.

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AionLabs catalog

Check other AionLabs models with comparable pricing, context, or release timing.

Open AionLabs models

Pareto 26.9

Pareto is a multimodal composite model built for research, coding, and agentic workflows, while delivering frontier-level performance across a broad range of general-purpose tasks.

Aion 3.5

Aion 3.5 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...