Standard Compute
Model comparison 2026

GPT-6.1 Sol vs GPT-6 Luna

GPT-6.1 Sol
OpenAI · Balanced · Proprietary
$4.40/1M · 1.1M ctx
GPT-6 Luna
OpenAI · Budget · Proprietary
$0.22/1M · 1.1M ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
GPT-6.1 Sol
GPT-6 Luna
Maker
OpenAI
OpenAI
Blended price / 1M
$4.40
$0.22
Input / output
$2.00 in · $10 out / 1M tokens
$0.10 in · $0.50 out / 1M tokens
Context window
1.1M
1.1M
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
9.6
8.7
Agentic Ability
9.7
8.5
Speed
7.0
9.3
Value for money
9.0
9.4
Reliability
9.3
9.1

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: GPT-6.1 Sol or GPT-6 Luna?

Updated 2026-10-13

Choose GPT-6.1 Sol if you want the default OpenAI model for coding agents, from routine changes to hard tasks. Choose GPT-6 Luna if you want cheap, fast subtasks, routing and subagents in OpenAI-based stacks.

In our editorial scoring, GPT-6.1 Sol leads in 3 of five dimensions (output quality, agentic ability and reliability), while GPT-6 Luna leads in 2. On price, GPT-6.1 Sol runs about $4.40 per 1M tokens (blended) and is proprietary; GPT-6 Luna is about $0.22 and proprietary.

Where GPT-6.1 Sol falls short
  • Slower than GPT-6 Sol at max effort (about 65 output tokens/s)
  • Prompts over 272K tokens are billed at higher rates
Full GPT-6.1 Sol breakdown →
Where GPT-6 Luna falls short
  • Weak on long agentic runs (16.4% on Terminal-Bench 4.0)
  • Clear quality step below GPT-6.1 Sol
Full GPT-6 Luna breakdown →

The agent matters as much as the model. Compare AI agents →

Current Claude, GPT, Gemini and open models are included with Standard Compute

Standard Compute

Current frontier models Claude Opus 5.5 · Claude Sonnet 5.5

Your agents never stop.
Your bill never grows.

Frontier models when it counts. Efficient models when it doesn’t. The most intelligence per dollar. One flat bill.

Plans from $19/mo · cancel anytime · 7-day fair refund

7-day fair refund No credit card needed Billing by Stripe1,800+ agent users

Related comparisons