93%
of the top score for 30% of the cost
Same model, one effort setting lower. Claude Opus 5.5 at high effort scored 54 at $1.82 per task. At max effort it scored 58 at $5.98. The last four points cost more than three times as much.
ReportData as of October 3, 2026Seven-minute read
The most expensive modelis rarely the right one.
A plain-English look at what AI models cost, how good they are, and where they run. The numbers come from independent benchmarks. The point is simple: matching the model to the job beats sending every call to the top tier.
In plain English
Four terms,then the numbers.
- What is a token?
- A piece of a word. Models bill by the million tokens read and written. Long prompts and long answers cost more.
- What is the Intelligence Index?
- One score from Artificial Analysis that combines ten independent tests: agentic office work, coding in a terminal, document reasoning, long-context reading, knowledge, and more.
- What is cost per task?
- What it actually cost to run one of those test tasks, counting every token the model read, reasoned with, and wrote. It captures models that think longer, not just the price list.
- Why does this matter?
- Most AI bills are set by which model handles the bulk of the calls. Picking per job, and proving each pick with tests, is the biggest lever on cost.
Three findings
Most of the qualityfor a fraction of the price.
86%
of the top score for 5% of the cost
GPT-6.1 Sol at high effort scored 50 at $0.32 per task. For most everyday agent steps, that gap in score never shows up in the result. The gap in the bill does.
79%
of the top score for 2% of the cost
MiMo-V2.6-Pro, the highest-scoring open-weight model on the board, scored 46 at $0.13 per task. Open weights also mean you choose where it runs.
The scoreboard
Score against cost,side by side.
Selected models from the Artificial Analysis leaderboard. The bar shows each model's score as a share of the top result. The last column shows how many times cheaper each one is to run per task.
Claude Opus 5.5 (max effort)
Anthropic · Closed
58
$5.98 per taskBaselineClaude Opus 5.5 (high effort)
Anthropic · Closed
54
$1.82 per task3.3x cheaperGPT-6 Astra (max)
OpenAI · Closed
53
$3.26 per task1.8x cheaperGemini 4 Argon (high)
Google · Closed
53
$1.99 per task3.0x cheaperGPT-6.1 Sol (high)
OpenAI · Closed
50
$0.32 per task19x cheaperMiMo-V2.6-Pro
Xiaomi · Open weights
46
$0.13 per task46x cheaperGLM-5.3 (max)
Z AI · Open weights
45
$2.01 per task3.0x cheaperGLM-5.3-Flash
Z AI · Open weights
42
$0.25 per task24x cheaperClaude Sonnet 5.5 (medium)
Anthropic · Closed
41
$0.59 per task10.1x cheaperDeepSeek V4.1 Flash (max)
DeepSeek · Open weights
39
$0.27 per task22x cheaperGPT-6 Luna (high)
OpenAI · Closed
33
$0.03 per task199x cheaper
Source: Artificial Analysis LLM Leaderboard, Intelligence Index v4.3.2, read October 3, 2026. Cost per task is measured on their test tasks; your own tasks will cost more or less.
Match the model to the job
If you are doing this,reach for that.
01
Hard reasoning
Contract review, multi-step planning, root-cause analysis, code changes across a large system.
What matters
Accuracy. A wrong answer here is expensive.
Usually a small share of an agent's calls, so the premium price stays contained.
Reach for
Top tier at a measured effort setting: Claude Opus 5.5 (high), GPT-6 Astra, Gemini 4 Argon.
02
Everyday agent steps
Drafting replies, summarizing a record, filling a form, choosing the next tool to call.
What matters
Good-enough quality at a price you can run all day.
This is where most of the volume lives, and where most of the savings come from.
Reach for
Mid tier: GPT-6.1 Sol, Claude Sonnet 5.5, GLM-5.3.
03
High-volume sorting
Classifying tickets, tagging documents, extracting fields, routing requests.
What matters
Cost and speed per call, at thousands of calls a day.
GPT-6 Luna (high) ran at $0.03 per task, about 199 times cheaper than the top setting.
Reach for
Small and fast: GPT-6 Luna, DeepSeek V4.1 Flash, GLM-5.3-Flash.
04
Live voice and chat
Phone agents, website chat, anything a person waits on.
What matters
Time to the first word.
The top-scoring max-effort setting averaged over eleven minutes to first output in the same test. Right for a research task, wrong for a phone call.
Reach for
Low-latency settings: DeepSeek V4.1 Flash (0.95 seconds to first output), Claude Sonnet 5.5 at medium (1.23 seconds).
05
Sensitive data
Patient records, financials, customer PII, anything under a compliance regime.
What matters
Where the data goes and who can see it.
Your prompts go to the provider you chose, under your contract, and never to the model's creator.
Reach for
Open-weight models served by a US provider you contract with, or deployed in your own cloud account.
A worked example
1,000 tasks a day,two ways.
An illustration using the benchmark cost per task. Real workloads differ, which is why we measure yours before recommending anything. The shape of the result rarely changes: the bulk of the calls decides the bill.
Every call on Claude Opus 5.5 (max effort)
$5,980
10% hard reasoning on Claude Opus 5.5 (high)
$182
30% everyday steps on GPT-6.1 Sol (high)
$96
60% high-volume sorting on GPT-6 Luna (high)
$18
Matched to the job
$296
95% lower, with the hard work still on a top-tier model
Open-weight models, US-hosted
Strong models you can runwhere you decide.
What open weights means
The model file itself is published. Any provider can run it, and so can your own cloud account. Your prompts go to whoever runs it under your contract, never to the company that trained it.
Where it runs
GLM-5.3 is served by 25 providers and DeepSeek V4.1 Flash by 22, including US companies such as Together AI, Fireworks, Baseten, Databricks, CoreWeave, DeepInfra, Modal. You can also deploy in your own AWS or Azure account.
What to check
Licenses vary, and some limit commercial use. Providers vary too: the same DeepSeek model ranged from $0.16 to $3.13 per task across providers, and GLM-5.3 endpoints kept between 94% and 100% of reference accuracy. Read each provider's data-retention terms, then test the endpoint you will actually use.
How we use this
Pick per step.Prove it with tests.
A benchmark tells you which models are worth trying. It does not tell you which one handles your invoices, your tickets, or your customers. For every agent we build, we write an evaluation set from your real cases first, then run candidate models against it.
Each step gets the least expensive model that passes. The hard steps keep a top-tier model. The tests stay in place after launch, so when a new model ships or a price changes, switching is a measured decision instead of a guess.
Sources and method
- Scores, cost per task, speed, and latency: Artificial Analysis LLM Leaderboard, Intelligence Index v4.3.2 (ten evaluations), read October 3, 2026.
- Provider counts, provider cost ranges, and endpoint accuracy: Artificial Analysis provider pages for GLM-5.3 and DeepSeek V4.1 Flash, read October 3, 2026.
- Model prices and rankings change monthly. We refresh this report when the leaderboard moves materially.
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Practices
Where this leads
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