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modelprices.xyz Cheapest 128k-Context LLM Leaderboard
x402
modelprices.xyz Cheapest 128k-Context LLM Leaderboard is a paid API for AI agents from modelprices.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns the 50 lowest-cost AI models with at least a 128,000-token context window, ranked by inference cost per token across 70+ providers, with input/output/cache pricing in USD per 1M tokens.
Price / call$0.01
Success—
StatusUnknown
How this service works
Cheapest 128k-context LLM leaderboard: the 50 lowest-cost AI models with a 128,000-token context window or larger, ranked by inference cost per token across 70+ providers. Input, output and cache USD per 1M tokens with exact context window and capability flags joined in. The standard long-document tier, priced side-by-side. Refreshed hourly.
Output
A ranked list of up to 50 AI models, each with: model name, provider, input cost (USD/1M tokens), output cost (USD/1M tokens), cache cost (USD/1M tokens), exact context window size, and capability flags. Data is refreshed hourly.
Example use cases
Cheapest model for long legal docs
“I need to process lengthy legal contracts — find me the cheapest AI models that can handle at least 128k tokens so I can pick the most cost-effective one for my pipeline.”
Budget LLM selection for RAG system
“I'm building a RAG system that needs a big context window. Pull up the cheapest 128k-context models ranked by price so I can decide which one fits my budget.”
Cost comparison before switching providers
“Before we switch our AI provider, can you check the current cheapest 128k-context LLMs across all providers and show me input and output pricing per million tokens?”
Technical details
Endpoint
GEThttps://modelprices.xyz/llm/cheapest/128k-contextWhen to prefer
Use this endpoint when you need to identify the most cost-efficient LLMs specifically for long-document or large-context workloads (128k+ tokens). Prefer this over the general cheapest-model endpoint when context window size is a hard constraint, and over provider-specific pricing tables when you want a cross-provider comparison in a single call. Ideal for automated model-selection pipelines, cost optimization workflows, and budget-constrained LLM deployments.
Side effects
- Service temporarily unavailable (503) if the pricing data feed is being refreshed
- Payment required error (402) if the $0.01 USDC per-call fee is not included
- Empty or reduced result set if fewer than 50 models currently meet the 128k context threshold
- Stale data risk within the hourly refresh window
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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