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OpenAI · Efficient

GPT 6 Luna Pro

Added Sep 22, 2026

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Use in the app

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.

  • Reasoning
  • Tools
  • Vision
  • Structured output
  • PDF input
Input
Text, Images
Output
Text
Reasoning effort
low · medium · high · xhigh · max
Discovery tier
Efficient

Pricing

USD per 1M tokens
Input
$0.10
Output
$0.50
Cache read
$0.01
Cache write
$0.13

Reference prices as published by the model provider. API example

Specifications

Context window
1.1M
Max output
128K
Average output (7 days)
2.8K tokens
Longer than 96% of 473 models

Side by side

GPT 6 Luna Pro compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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GPT 6 Luna ProOpenAIThis modelClaude Haiku 5.5AnthropicRemove
ProviderOpenAIAnthropic
Discovery tierEfficientEfficient
AddedSep 22, 2026Oct 7, 2026
Limits
Context window1.05MBest1M
Max output128K128K
Average output2.8K tokens1.5K tokens
Pricing, USD per 1M tokens
Input$0.10$0.10
Output$0.50$0.50
Cache read$0.01$0.01
Cache write$0.13$0.13
Performance
Throughput295.0 tok/s367.9 tok/sBest
Time to first token26.8 s6.3 sBest
Request success (24h)100.0%Best99.9%
Benchmark indexes
Intelligence Index—43.4
Capabilities
ReasoningYesYes
ToolsYesYes
VisionYesYes
Structured outputYesYes
PDF inputYesYes
Reasoning effortlow, medium, high, xhigh, maxlow, medium, high, xhigh, max

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • GPT 6 Luna Pro
  • Claude Haiku 5.5

Intelligence Index

  • GPT 6 Luna Pro—
  • Claude Haiku 5.543.4
3.8Catalog models by score55.1

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 35.4%

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 13.9%

  • Harvey LAB-AAv1.1

    Legal tasks passed in full, with no material hallucination

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 0.6%

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 1,575 Elo

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 1,619 Elo

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 20.8%

  • AA-LCRv1.1

    Reasoning across long documents

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 82.7%

  • MLCR-AA

    Long-context reasoning over medical records

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 35.0%

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 44.4%

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 32.8%

  • SciCode

    Scientific computing in Python

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 55.0%

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • GPT 6 Luna Pro: —
    • Claude Haiku 5.5: 82.7%

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Throughput
295.0 tok/s
Faster than 92% of 260 models
Time to first token
26.8 s
Quicker than 1% of 260 models
Prompt cache hits
31.3%
About $0.0719 per 1M input tokens with caching
Request success (24h)
100.0%
Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 94.4%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-6-luna-pro",
    "reasoning_effort": "medium",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="openai/gpt-6-luna-pro",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

OpenAI

Other OpenAI models, starting with the same family.