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  1. Models
  2. Text
  3. OpenAI

GPT 6 Luna

GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, suited for high-volume chat, classification, and lightweight agent workflows.

  • Reasoning
  • Vision
  • Native PDF input
  • Tool Calling
  • Structured Output

Added Sep 22, 2026

Pricing

Auto routing · per 1M tokens
Input
$0.10
Output
$0.50
Cache read
$0.01
Compare provider prices

Specifications

Context window
1.1M
Max output
128K
Avg output (7d)
353 tokens
Longer than 35% of models

Benchmarks

Sourced from Artificial Analysis.

Intelligence Index

18.3

Intelligence Index: 18.3
Better than 25% of models compared

Agentic work

AutomationBench-AA

Workflow automation with guardrail penalties

40.5%

Better than 54% of models compared

AutomationBench-AA Tasks Completed

Fully completed workflows without guardrail violations

10.2%

Better than 50% of models compared

AA-Briefcase v1.1

Agentic knowledge work (Elo)

1096 Elo

Better than 52% of models compared

GDPval-AA v2.1

Economically valuable tasks (Elo)

1270 Elo

Better than 62% of models compared

Document reasoning

GDP.pdf

Professional PDF reasoning: all-pass rate

13.8%

Better than 53% of models compared

AA-LCR v1.1

Long context reasoning with updated grading

78.3%

Better than 79% of models compared

MLCR-AA

Medical long-context reasoning

18.3%

Better than 63% of models compared

Reasoning

HLE

Humanity's Last Exam

28.3%

Better than 74% of models compared

CritPt

Research-level physics reasoning

1.1%

Coding

Terminal-Bench v4.0

Practical coding and terminal tasks

2.5%

Better than 46% of models compared

SciCode

Python programming for scientific computing

50.9%

Better than 56% of models compared

Knowledge

AA-Omniscience Accuracy

Proportion of correctly answered questions

30.1%

AA-Omniscience Hallucination Rate

Rate of incorrect answers among non-correct responses

80.0%

Legacy benchmarks

AA-LCR (unversioned / legacy)

Long context reasoning evaluation

78.3%

Better than 79% of models compared

GDPval-AA (unversioned / legacy)

Economically valuable tasks

27.6%

Last updated Nov 1, 2026

Artificial Analysis

Providers

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Reliability

Related text models

Compare GPT 6 Luna with similar models from the same provider or model family.

GPT 6 Luna Pro

openai/gpt-6-luna-pro

GPT-6 Luna Pro uses the same underlying model as GPT-6 Luna with Pro reasoning mode enabled for higher-quality responses on complex tasks.

GPT Luna Latest

openai/gpt-luna-latest

Compatibility alias that routes to GPT 6 Luna, the latest supported GPT Luna model.

GPT 5.6 Luna

openai/gpt-5.6-luna

GPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume chat, classification, lightweight agentic workflows, and latency-sensitive reasoning tasks.

GPT 5.6 Luna Pro

openai/gpt-5.6-luna-pro

GPT-5.6 Luna with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.

GPT 6.1 Terra Pro

openai/gpt-6.1-terra-pro

GPT-6.1 Terra Pro uses the same underlying model as GPT-6.1 Terra with Pro reasoning mode enabled for higher-quality responses on complex tasks.

GPT 6.1 Terra

openai/gpt-6.1-terra

GPT-6.1 Terra is a fast, efficient model for everyday work, with strong visual reasoning, clearer writing, and capable coding at half GPT-6.1 Sol’s standard token prices. It supports text and image input, tool calling, structured outputs, and optional reasoning from none through max.