Standard Compute
Model Comparison 2026

GPT-5.4 Mini vs GPT-5.6 Luna

GPT-5.4 Mini
OpenAI · Budget · Proprietary
$1.88/1M · 400K ctx
GPT-5.6 Luna
OpenAI · Budget · Proprietary
$1.25/1M · 1.1M ctx

Community Vote

Pick a winner in each dimension — change your vote anytime. 2 votes cast so far.

Output Quality
Correctness and depth of what it produces
GPT-5.4 Mini 100%0% Luna
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
GPT-5.4 Mini 0%100% Luna
Speed
Tokens per second and time-to-first-token
Value for $
How much capability you get per dollar
Reliability
Consistent results — fewer refusals, loops, and format breaks

Specs & Pricing, Side by Side

Spec
GPT-5.4 Mini
Luna
Maker
OpenAI
OpenAI
Blended price / 1M
$1.88
$1.25
Input / output
$0.75 in · $4.50 out / 1M tokens
$0.50 in · $3.00 out / 1M tokens
Context window
400K
1.1M
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
8.0
8.4
Agentic Ability
8.1
8.3
Speed
9.0
9.3
Value for $
8.2
9.0
Reliability
8.7
9.1

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

Verdict: GPT-5.4 Mini or Luna?

Updated 2026-08-02

Choose GPT-5.4 Mini if you want high-volume, low-complexity agent steps on a budget. Choose GPT-5.6 Luna if you want cheap, fast subtasks, routing, and subagents in OpenAI-based stacks.

In our editorial scoring, GPT-5.6 Luna leads in 5 of five dimensions (output quality, agentic ability, speed, value for $ and reliability), while GPT-5.4 Mini leads in 0. On price, GPT-5.4 Mini runs about $1.88 per 1M tokens (blended) and is proprietary; GPT-5.6 Luna is about $1.25 and proprietary.

Across 2 community votes on this matchup, the community has it tied. Cast your own vote above to move the needle.

Where GPT-5.4 Mini falls short
  • Not for hard reasoning or tricky refactors
  • Quality below the full GPT-5.4
Full GPT-5.4 Mini breakdown →
Where Luna falls short
  • Clear quality step below Terra and Sol
  • Very new — behavior under long agent chains still settling
Full Luna breakdown →

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