Market Brief: Tuesday, October 20, 2026

Today's lesson

The agent stack: model, instructions, tools, harness, and environment

Map the components that make an AI agent work and the boundary each component owns. Why it matters today: Today's lesson connects the AI Engineering track to the compute market readers are watching.

Term of the Day

Cost per completed task

Cost per completed task is the total spend needed to get one usable result. Count retries, tool calls, and failed attempts along with the final successful model request. If ten accepted results cost $20 across all attempts, each completed task costs $2.

H100 IndexiWhat it costs to rent one H100 GPU for an hour on demand — the market’s anchor price.

Value

$4.29 / H100-hr

Last Price Change

Oct 16, 2026

Spot Compute PriceiThe cheaper, interruptible GPU price — a read on whether spare capacity is available.

Value

$2.46 / H100e-hourH100e-hour means an H100-equivalent GPU hour, a normalized unit used to compare different GPUs and providers.

Last Price Change

May 27, 2026

Model Serving CostiRoughly what it costs to run a model and generate its output at scale, per million tokens.

Value

$2.78 / 1M tokens

Last Price Change

Aug 8, 2026

GPU AvailabilityiHow easy or hard it is to actually get GPU capacity right now, scored 0–100.

Value

83 / 100 score

Last change

Sep 17, 2026

Oct 19, 2026

Curtis Hall proposes temporary 49.9MW gas power plant for Cardiff data center campus - report

The project described in “Curtis Hall proposes temporary 49.9MW gas power plant for Cardiff data center campus - report” adds prospective compute capacity, but permitting, power procurement, construction, and deployment timing prevent it from increasing immediately available GPU supply.

Oct 19, 2026

Carrier Connect secures customer for 4MW data center outside Atlanta, Georgia

The project described in “Carrier Connect secures customer for 4MW data center outside Atlanta, Georgia” adds prospective compute capacity, but permitting, power procurement, construction, and deployment timing prevent it from increasing immediately available GPU supply.

Oct 19, 2026

400MW data center eyed at old Navy cyber site in San Diego, California

The project described in “400MW data center eyed at old Navy cyber site in San Diego, California” adds prospective compute capacity, but permitting, power procurement, construction, and deployment timing prevent it from increasing immediately available GPU supply.

Oct 19, 2026

Alcoa sells New York aluminum smelter to data center developer for $315 million

The project described in “Alcoa sells New York aluminum smelter to data center developer for $315 million” adds prospective compute capacity, but permitting, power procurement, construction, and deployment timing prevent it from increasing immediately available GPU supply.

Oct 19, 2026

Israel to cap capacity of new data centers at 200MW - report

The project described in “Israel to cap capacity of new data centers at 200MW - report” adds prospective compute capacity, but permitting, power procurement, construction, and deployment timing prevent it from increasing immediately available GPU supply.

H100 GPU Pricing Report: September 2026

Canonical CT-H100 median, reviewed H100 provider rows, freshness dates, and composition caveats in one citable report.

Previous issue: Market Brief: Monday, October 19, 2026

Stranded natural gas could power offshore data centers