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Artificial Analysis Long Context Reasoning Benchmark Leaderboard

A challenging benchmark measuring language models' ability to extract, reason about, and synthesize information from long-form documents ranging from 10k to 100k tokens (measured using the cl100k_base tokenizer).

Background

Long-form text comprehension represents an under-studied class of evaluations where humans dramatically outscore language models, despite expanding context windows in current AI systems.
LCR features 100 questions across diverse document types including academic papers, company financials, government consultations, legal documents, industry reports, and marketing materials, requiring genuine reasoning rather than simple data extraction.
Each question demands multi-step reasoning to synthesize information from dispersed sections, understand complex domain-specific content, and produce unambiguous answers that mid-2024 frontier models achieve less than 50% accuracy on.

Methodology

All evaluations are conducted independently by Artificial Analysis. More information can be found on our Intelligence Benchmarking Methodology page.

Highlights

  • GPT-5.2 Codex (xhigh) scores the highest on AA-LCR with a score of 75.7%, followed by GPT-5 (high) with a score of 75.6%, and GPT-5.1 (high) with a score of 75.0%

Artificial Analysis Long Context Reasoning Benchmark Leaderboard: Results

Independently conducted by Artificial Analysis

Artificial Analysis Long Context Reasoning Benchmark Leaderboard: Token Usage

Tokens used to run the evaluation
Answer tokens
Input tokens
Reasoning tokens

The total number of tokens used to run the evaluation, including input tokens (prompt), reasoning tokens (for reasoning models), and answer tokens (final response).

Artificial Analysis Long Context Reasoning Benchmark Leaderboard: Cost Breakdown

Cost (USD) to run the evaluation
Input cost
Reasoning cost
Answer cost

The cost to run the evaluation, calculated using the model's input and output token pricing and the number of tokens used.

Artificial Analysis Long Context Reasoning Benchmark Leaderboard: Score vs. Release Date

Most attractive region
Alibaba
Amazon
Anthropic
DeepSeek
Google
Kimi
Korea Telecom
KwaiKAT
LG AI Research
MBZUAI Institute of Foundation Models
Meta
MiniMax
Mistral
NVIDIA
OpenAI
TII UAE
xAI
Xiaomi
Z AI

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