API cost decision in 10 seconds

Aion-2.0 vs GPT-5.1-Codex-Mini

Pick GPT-5.1-Codex-Mini when budget and context both matter.

Pricing data updated: 2026-05-26T11:08:00Z Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GPT-5.1-Codex-Mini when budget and context both matter.

On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.6 for Aion-2.0, saving $0.35 (21.9% lower).

Cost-first pickGPT-5.1-Codex-Mini

Context-first pickGPT-5.1-Codex-Mini

Sample savings$0.3521.9%

10x traffic gap$3.5

GPT-5.1-Codex-Mini is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $3.5. 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 GPT-5.1-Codex-Mini, balanced workload favors GPT-5.1-Codex-Mini, and output-heavy chatbot favors Aion-2.0.

Workload shape	Token mix	Better pick	Aion-2.0	GPT-5.1-Codex-Mini
Input-heavy / RAG	5M input + 500K output	GPT-5.1-Codex-Mini	$4.8	$2.25
Balanced workload	1M input + 1M output	GPT-5.1-Codex-Mini	$2.4	$2.25
Output-heavy chatbot	1M input + 5M output	Aion-2.0	$8.8	$10.25

Cheaper input GPT-5.1-Codex-Mini $0.8 vs $0.25 / 1M

GPT-5.1-Codex-Mini is $0.55 cheaper per 1M input tokens (68.8% lower; 3.2x difference).

Cheaper output Aion-2.0 $1.6 vs $2 / 1M

Aion-2.0 is $0.4 cheaper per 1M output tokens (20% lower; 1.25x difference).

Larger context GPT-5.1-Codex-Mini 131.07K vs 400K

GPT-5.1-Codex-Mini has 268.93K more context (3.05x larger).

Sample workload GPT-5.1-Codex-Mini $1.6 vs $1.25

GPT-5.1-Codex-Mini is $0.35 cheaper on the standard workload (21.9% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.

Monthly input tokens Monthly output tokens

Aion-2.0 Calculating… Estimated API cost

GPT-5.1-Codex-Mini 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-5.1-Codex-Mini has the lower input price; Aion-2.0 has the lower output price; GPT-5.1-Codex-Mini offers the larger context window. For the 1M input plus 500K output sample, GPT-5.1-Codex-Mini is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $1.6 for Aion-2.0 and $1.25 for GPT-5.1-Codex-Mini.

Best Fit

Choose Aion-2.0 when you care most about lower output-token price.

Choose GPT-5.1-Codex-Mini when you care most about lower input-token price, and larger context window.

Decision Notes

On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.6 for Aion-2.0, saving $0.35 (21.9% lower).
GPT-5.1-Codex-Mini is $0.35 cheaper on the standard workload (21.9% lower).
GPT-5.1-Codex-Mini is $0.55 cheaper per 1M input tokens (68.8% lower; 3.2x difference).
Aion-2.0 is $0.4 cheaper per 1M output tokens (20% lower; 1.25x difference).
GPT-5.1-Codex-Mini has 268.93K more context (3.05x larger).

Head-to-Head Specs

Feature	Aion-2.0 (AionLabs)	GPT-5.1-Codex-Mini (OpenAI)
Input Price prompt tokens per 1M	$0.8	$0.25
Completion Price per 1M tokens	$1.6	$2
Sample Workload Cost 1M input + 500K output	$1.6	$1.25
Context Window	131.07K	400K
Release Date	2026-02-23	2025-11-13

Use-Case Decision Matrix

Use case	Better pick	Why
Budget-constrained production	GPT-5.1-Codex-Mini	On the standard 1M input plus 500K output workload, GPT-5.1-Codex-Mini is estimated at $1.25 vs $1.6 for Aion-2.0, saving $0.35 (21.9% lower).
High-volume input processing	GPT-5.1-Codex-Mini	Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbots	Aion-2.0	Lower output-token price matters most when assistants generate many completion tokens.
RAG or long-document work	GPT-5.1-Codex-Mini	A larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps

Aion-1.0-Mini can replace Aion-2.0 when lower sample workload cost matters most: $1.4.
gpt-oss-120b (free) can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.
gpt-oss-20b (free) can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.
gpt-oss-20b can replace GPT-5.1-Codex-Mini when lower sample workload cost matters most: $0.1.

Larger context near this budget

Llama 4 Scout offers 10M context with $0.23 sample workload cost.
Owl Alpha offers 1.05M context with $0 sample workload cost.
Gemini 3.1 Flash Lite offers 1.05M context with $1 sample workload cost.
DeepSeek V4 Pro offers 1.05M context with $0.87 sample workload cost.

Popular competitors

No popular competitor is currently available.

Cheaper alternatives

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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

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AionLabs catalog

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OpenAI catalog

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Aion-2.0

Aion-2.0 is a variant of DeepSeek V3.2 optimized for immersive roleplaying and storytelling. It is particularly strong at introducing tension, crises, and conflict into stories, making narratives feel more engaging....

GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex