GPT-5.1 (batch)

OPENAI Developer Architecture Profile

OpenRouter ↗HuggingFace ↗

Intelligence (ELO)1490Chatbot Arena Verified

Max Context Limit400,000Max Out: 128,000 tokens

Prompt Caching90% OFF$0.06 / 1M cached

Standard API / 1M$5.63🧠 Deep Reasoner

Model Capabilities & Contract SLAs

Coding & Logic
Fictional
Reasoning
Agentic
📋 Strict JSON Schema
🛠️ Native Tool Calling
🧠 Extended Test-Time Reasoning

GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...

Granular Pricing Matrix

Input Tokens (Standard Prompt)$0.63 / 1M

⚡ Cached Input (Prompt Cache Read)90% OFF$0.06 / 1M

Output Tokens (Completion)$5.00 / 1M

Pricing data via OpenRouter. Sync: 10/2/2026

Evaluate Competitors

VS Engine MatchupGPT-5.1 (batch) vs OpenAI: GPT-5.2 (batch)VS Engine MatchupGPT-5.1 (batch) vs OpenAI: GPT-5 Pro VS Engine MatchupGPT-5.1 (batch) vs OpenAI: GPT-5 (batch)VS Engine MatchupGPT-5.1 (batch) vs OpenAI: GPT-5 Mini (batch)VS Engine MatchupGPT-5.1 (batch) vs OpenAI: o3 Mini High VS Engine MatchupGPT-5.1 (batch) vs Qwen: Qwen2.5 VL 72B Instruct