Neither wins outright: AionLabs: Aion 3.5 Mini is the pick when cost matters at scale, OpenAI: GPT Chat Latest when you need to fit long inputs in one request.
| Spec | AionLabs: Aion 3.5 Mini | OpenAI: GPT Chat Latest |
|---|---|---|
| Provider | Aion Labs | OpenAI |
| Input price (per 1M tokens) | $0.70 | $5.00 |
| Output price (per 1M tokens) | $1.40 | $30.00 |
| Blended price (3:1 input/output) | $0.87 | $11.25 |
| Cheaper than … of all models we track | 42% | 5% |
| Context window | 262K tokens (~393 pages) | 400K tokens (~600 pages) |
| Larger context than … of all models | 47% | 62% |
| Max output per response | 33K tokens (~24,600 words) | 128K tokens (~96,000 words) |
| Input types | text | text, image, file |
| Output types | text | text |
| Free variant | No | No |
| Listed since | 2026-09-23 | 2026-05-05 |
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | AionLabs: Aion 3.5 Mini | OpenAI: GPT Chat Latest | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $80.50 | $975 | AionLabs: Aion 3.5 Mini saves $895 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $98.00 | $900 | AionLabs: Aion 3.5 Mini saves $802 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $101 | $960 | AionLabs: Aion 3.5 Mini saves $859 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $64.40 | $580 | AionLabs: Aion 3.5 Mini saves $516 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $36.40 | $280 | AionLabs: Aion 3.5 Mini saves $244 |
| Capability | AionLabs: Aion 3.5 Mini | OpenAI: GPT Chat Latest | What it lets you do |
|---|---|---|---|
| Tool / function calling | ✓ Yes | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | ✓ Yes | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | ✓ Yes | — | spend extra tokens thinking before answering hard problems |
| Image input | — | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | — | — | take speech or audio directly |
| File / PDF input | — | ✓ Yes | accept documents without your own parsing step |
| Image output | — | — | generate images, not just text |
| Built-in web search | — | ✓ Yes | answer from live web results |
| Seed (reproducible sampling) | — | ✓ Yes | repeat a generation for tests and evals |
| Log-probabilities | — | — | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Neither wins outright: AionLabs: Aion 3.5 Mini is the pick when cost matters at scale, OpenAI: GPT Chat Latest when you need to fit long inputs in one request. In short: AionLabs: Aion 3.5 Mini when cost matters at scale, you need reasoning / thinking mode, you want the newer model; OpenAI: GPT Chat Latest when you need to fit long inputs in one request, you need image input, you need file / PDF input, you need built-in web search, you need seed (reproducible sampling), you generate long outputs in one go.
AionLabs: Aion 3.5 Mini is cheaper: $0.87 vs $11.25 per 1M tokens at a typical 3:1 input/output mix, 92% less. For 50,000 support conversations a month that is $80.50 against $975.
AionLabs: Aion 3.5 Mini costs $0.70 per 1M input tokens and $1.40 per 1M output tokens; OpenAI: GPT Chat Latest costs $5.00 input and $30.00 output. Output tokens are billed separately, so long answers shift the gap.
OpenAI: GPT Chat Latest: 400K tokens, about 600 pages, against 262K (about 393 pages) for AionLabs: Aion 3.5 Mini.
Tool calling — AionLabs: Aion 3.5 Mini: yes, OpenAI: GPT Chat Latest: yes. JSON-schema structured output — AionLabs: Aion 3.5 Mini: yes, OpenAI: GPT Chat Latest: yes.
Only OpenAI: GPT Chat Latest accepts image input; AionLabs: Aion 3.5 Mini is text-only for input.
No free variant is listed for either; both are pay-per-token.
AionLabs: Aion 3.5 Mini can write up to 33K tokens (about 24,600 words) per response; OpenAI: GPT Chat Latest up to 128K (about 96,000 words).
AionLabs: Aion 3.5 Mini was listed on 2026-09-23; OpenAI: GPT Chat Latest on 2026-05-05.
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