OpenAI: GPT-6 Luna Pro

OpenAI

flagship

Capabilities

VisionToolsStructured OutputExtended ThinkingLong ContextCode

Strengths

Exceptional long-document processing (1M+ context window)
Strong vision and multimodal understanding
Pro-mode reasoning for complex analytical tasks
Structured output and tool-use capabilities

Weaknesses

Slow inference due to extended thinking overhead
High operational cost in pro mode
Proprietary and opaque reasoning mechanism
Limited sustainability and infrastructure transparency

Pricing

Input / 1M tokens

$0.09999999999999999

Output / 1M tokens

$0.5

Context window

1,050k

Transparency

Open weights

0.0 / 10

Open training data

0.0 / 10

Open methodology

2.5 / 10

Licence openness

1.0 / 10

Provider disclosure

3.0 / 10

FMTI company score

N/A

Composite:3.5 / 10

Closed-source proprietary model. OpenAI publishes limited architectural and training methodology details. Extended thinking and pro-mode reasoning features are opaque. No public access to model weights or training data.

Sustainability

Inference energy

N/A

Training footprint

N/A

Provider infrastructure

4.5 / 10

Composite:4.5 / 10

OpenAI's infrastructure sustainability commitments are not publicly detailed. Large flagship model with extended thinking mode likely incurs significant inference energy costs. No published green infrastructure targets.

Task Fitness

question answering

80%

code

78%

mathematics

83%

business communication

83%

vision

85%

analysis

80%

extraction

83%

long-form generation

77%

research

77%

reasoning

83%

summarisation

88%

translation

82%

conversation

80%