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The models we use

The right model for the job.

New AI models ship every month. We track them, test them, and put the right one behind each part of your business, so you get the outcome without keeping up with it yourself.

Updated 6 October 2026

01 / BY JOB

Business task, model, and why.

Business taskModelWhy
Answering and qualifying enquiries, 24/7Fast, low-cost modelse.g. Claude Haiku 4.5, GPT-6 LunaInstant replies at a low running cost, day and night.
Proposals, analysis and complex decisionsFrontier reasoning modelse.g. Claude Fable 5.1, GPT-6 AstraThey can follow multi-step business logic and weigh trade-offs.
Long documents, reports and contractsLong-context modelse.g. Claude Opus 5.5, Claude Sonnet 5.5They read and draft from the full document, such as a property valuation report, not a summary of it.
Building and maintaining your softwareCoding and agentic modelse.g. Claude Opus 5.5, GPT-6.1 SolFaster, cheaper builds and changes, checked by a person before they ship.
Voice and phoneSpeech modelse.g. GPT-Live 1, Gemini 3.8 LiveCalls answered in a natural voice, then summarised for your team.
Reading forms, photos and invoicesVision modelse.g. Gemini 3.8 Flash, Claude Sonnet 5.5The details come out of the image, so nobody retypes them.
02 / RUNNING COST

Cost to answer 1,000 customer enquiries.

Estimate In US dollars, at each company’s published standard API price.

Estimated cost in US dollars to answer 1,000 customer enquiries, by model
ModelCompanyEstimated cost (USD)
GPT-6 LunaOpenAI$0.55
Gemini 3.8 FlashGoogle$4.13
Claude Haiku 4.5Anthropic$5.50
Claude Sonnet 5.5Anthropic$11
GPT-6.1 SolOpenAI$11
Claude Opus 5.5Anthropic$22
Claude Fable 5.1Anthropic$55
GPT-6 AstraOpenAI$55
Method: each enquiry is counted as about 3,000 tokens in (your instructions, business details and the conversation) and 500 tokens out, multiplied by each company’s official per-token price, checked 6 October 2026. Excludes caching discounts, tax and hosting. Voice, transcription and open-weight models are priced differently and aren’t shown.

What’s one extra job worth?

Type your numbers to see the comparison.

Running cost uses Claude Sonnet 5.5, the middle of the chart above, at its official price checked 6 October 2026, and the same enquiry size as the chart. It’s an estimate of the AI’s cost only.

The AI is the cheap part. The real investment is building and running the system around it. We quote that after a 60-minute consultation.

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03 / CURRENT MODELS

Current models we work with.

Checked every day against each company’s own announcements, documentation and changelogs. New generally available models are added automatically from those sources only. Follow the links for the details.

OpenAI

Anthropic (Claude)

Google (Gemini)

Open-weight models

04 / BEYOND THE MODEL

A model on its own doesn’t run a business.

We connect it to your CRM, email, calendar, database and tools. We give it skills, which are repeatable procedures, and your business rules. And we keep a person in the loop for anything that matters.

When a better model ships, we test it on your real work and switch if it’s better. You get the outcome, not a lock-in.

05 / START HERE

What should be working better?

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Model names are trademarks of their owners. AETHER is independent and not affiliated with or endorsed by these companies. Last reviewed: 6 October 2026.