Why Machine Intelligence Keeps Getting Cheaper

Inference at a fixed capability has become dramatically cheaper; reliability, latency, memory movement, and demand now determine the useful answer.

Last updated September 2026

The argument

The relevant curve fixes task quality and measures cost, latency, and energy. Model prices can collapse while frontier training expands because efficiency diffuses old capability and investment pushes the frontier outward simultaneously.

  • Stanford's 2025 AI Index estimated a more than 280-fold fall in cost for GPT-3.5-level MMLU performance from late 2022 to late 2024.
  • The smallest model exceeding 60% MMLU shrank from 540B parameters in 2022 to 3.8B in 2024.
  • MLPerf's median Llama 2 70B inference score doubled in the year to v5.0.
  • Quality-adjusted cost still depends on prompt length, output length, latency, batching, and reliability.

Measured results, derived quantities, projections, targets, and editorial inference are identified by context. Announced capacity is never treated as operating performance.

Part I: What changed

Old frontier capability becomes a commodity quickly

Distillation, quantization, sparsity, better kernels, newer accelerators, and competition drive the same measured capability onto smaller and cheaper systems. New reasoning workloads can consume the savings.

Three numbers that locate the frontier

>280×Fall in price for a fixed MMLU performance point.
142×Reduction in smallest model above 60% MMLU, 2022–2024.
3.3×Best MLPerf Llama 2 70B score gain from v4.0 to v5.0.

API price is not provider cost; MMLU is not every useful task; benchmark throughput is not interactive service quality.

Part II: The measurable curve

Fix capability before claiming a cost curve

A valid curve holds quality, context, latency, and availability constant. Tokens per dollar without correctness can reward cheap failure; benchmark accuracy without serving constraints can reward unusable delay.

Smaller models can win by routing easy work locally and escalating hard cases.

Longer reasoning can trade additional compute for accuracy, turning inference demand into a variable chosen at runtime.

Part III: The physical stack

The headline metric sits on a system

Each layer can become the bottleneck even when the layer before it improves.

01

Model and data

Architecture, training distribution, post-training, and retrieval determine what quality is possible.

Measure
Task quality · robustness
Failure mode
Data and evaluation
02

Numerics and memory

Precision, sparsity, cache, and bandwidth determine how efficiently weights and activations move.

Measure
Bytes/token · joules/token
Failure mode
Memory bandwidth
03

Serving system

Batching, routing, speculative decoding, and scheduling trade throughput against latency.

Measure
Tokens/s · tail latency
Failure mode
Utilization
04

Application

Tools, verification, humans, and workflow design determine whether an answer creates value.

Measure
Cost per accepted outcome
Failure mode
Reliability
Part IV: The floor

The irreducible unit is useful information, not a token

Physics sets distant switching and communication floors, but current system cost is dominated by moving data and maintaining utilization. Application value depends on correct, timely outcomes rather than generated symbols.

Compute + memory + serving÷accepted task outcomes=cost of intelligence
Part V: The bottleneck shift

Cheap inference expands demand and exposes verification

As raw tokens become cheap, users ask for more context, reasoning, modalities, and agents. The bottleneck moves into trustworthy evaluation, tool execution, and human review.

Smaller specialists

Route tasks to the least expensive model that meets quality.

Better serving

Batch, cache, and schedule without violating latency.

Hardware-software codesign

Match numerics and memory hierarchy to workloads.

Outcome evaluation

Measure accepted work and downstream error cost.

An optimistic view, with conditions

Machine intelligence becomes metered infrastructure

Capability at yesterday's frontier will keep getting cheaper, while premium spend concentrates on difficult, verifiable, high-value tasks.

Sources, method, and boundaries

Price and benchmark results are measured but use different boundaries. No API list price is treated as underlying production cost.