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  3. GPT-5.6 Luna vs Mistral: Mistral Small 4

Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)

GPT-5.6 Luna vs Mistral: Mistral Small 4 benchmark

This page compares GPT-5.6 Luna (OpenAI) and Mistral: Mistral Small 4 (Mistral) using the latest snapshots we have as of Aug 17, 2026. GPT-5.6 Luna wins on output price at $0.6/1M. GPT-5.6 Luna has the larger context window (1.1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.

Quick answer

GPT-5.6 Luna vs Mistral: Mistral Small 4 is a dated snapshot, not a lab score. GPT-5.6 Luna is the cheaper output token. Elo is crowd preference, not an exam. Pick the column that matches the job.
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OpenAI

GPT-5.6 Luna

OpenAI 5.6 fast/cheap tier. Official API $0.20/$1.20 per 1M after the Jul 30 80% Luna cut.

Luna Fast / VolumeElo 1,466$0.6/1M out

Mistral

Mistral: Mistral Small 4

Auto-discovered from OpenRouter (mistralai/mistral-small-2603). Preview until a second source matches.

$0.6/1M out
Model Lineage & Multi-Tier Derivatives🇺🇸 US Frontier

GPT-5.6 Series Family (3 models)

Compare vs Base (GPT-5.6 Sol)
GPT-5.6 Sol
OpenAI· 2026-07-09
Flagship Base
CoT ScalerFast Route
Elo
1608
Speed
84 tok/s
Price
$30.00 / 1M
View model →vs this
GPT-5.6 Terra
OpenAI· 2026-07-09
Terra Mid-Tier
Fast Route
Elo
1548
Speed
128 tok/s
Price
$6.00 / 1M
-60 Elo-80% cost1.5x speed
View model →vs this
GPT-5.6 Luna
OpenAI· 2026-07-09
Luna Fast / Volume
Fast Route
Elo
1466
Speed
188 tok/s
Price
$0.60 / 1M
-142 Elo-98% cost2.2x speed
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Quick vs:vs Claude Opus 4.5vs Claude Opus 4.6vs Claude Sonnet 4.5vs Claude 3.7 Sonnet

Interactive Comparison Diagram

Matchup Breakdown

Tug-of-War Matchup Matrix

Category wins across intelligence, speed, and pricing efficiency.

GPT-5.6 Luna (9)vsMistral: Mistral Small 4 (0)
GPT-5.6 Luna: 9W (100%)Overall: GPT-5.6 LunaMistral: Mistral Small 4: 0W (0%)
← GPT-5.6 Luna1 tiesMistral: Mistral Small 4 →
GPT-5.6 Luna (5/5)

Intelligence & Reasoning

Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy

Preference Elo
1,466vs—
Coding Elo
1,458vs—
SWE-bench
61.8%vs—
LiveBench
64.2%vs—
GPQA Diamond
75.4%vs—
GPT-5.6 Luna: 5WMistral: Mistral Small 4: 0W
GPT-5.6 Luna (2/2)

Speed & Latency

Generation throughput and time to first token responsiveness

Output speed
188 tok/svs—
Time to first token
88 msvs—
GPT-5.6 Luna: 2WMistral: Mistral Small 4: 0W
GPT-5.6 Luna (2/3)

Pricing & Capacity

Cost per million tokens and max context window length

Output price
$0.6/1Mvs$0.6/1M
Input price
$0.1/1Mvs$0.15/1M
Context window
1.1Mvs262k
GPT-5.6 Luna: 2WMistral: Mistral Small 4: 0W
Capability Matchup Radar

Multi-Dimensional Capability Radar

Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.

Tap any node to inspect
Percentile 0–100
Dimensional AdvantageGPT-5.6 Luna 5/6
Preference Elo

No shared data

No shared data

Throughput Speed

No shared data

No shared data

Token Price Efficiency

GPT-5.6 Luna

Same price

Full Benchmark Score Matrix

—
Elo
High is better
1,466
EloHigh is better
—
Code Elo
High is better
1,458
Code EloHigh is better
—
LiveBench
High is better
64.2%
LiveBenchHigh is better
—
SWE-bench
High is better
61.8%
SWE-benchHigh is better
—
GPQA
High is better
75.4%
GPQAHigh is better
—
TTFT
Low is better
88 ms
TTFTLow is better
—
Speed
High is better
188 tok/s
SpeedHigh is better
—
In $
Low is better
+50%$0.10 / 1M
In $Low is better
$0.15 / 1M
Out $
Low is better
$0.60 / 1M
Out $Low is better
$0.60 / 1M
Context
High is better
+301%1.1M
ContextHigh is better
262k
Interactive Simulator (USD)

Workload Cost & Savings Calculator

Simulate monthly production API costs in USD (US Dollar).

Save up to 12% with GPT-5.6 Luna
Monthly Volume50M tokens/mo
Quick Presets:
Token Ratio (In vs Out)70% In / 30% Out
RAG / Search (10% out)Coding / Chat (50% out)
GPT-5.6 Luna$12.50 / mo
In: $3.5Out: $9
Mistral: Mistral Small 4$14.25 / mo
In: $5.25Out: $9
Estimated Cost Delta

GPT-5.6 Luna is estimated to save $1.75/month ($21/year).

Based on 50M tokens (30% gen)

Key Selection Recommendations

  • 1
    GPT-5.6 Luna:Pick GPT-5.6 Luna when you are optimizing output cost.
  • 2
    GPT-5.6 Luna:Pick GPT-5.6 Luna for million-token RAG or long-document jobs.

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatGPT-5.6 Luna

Lower output list price ($0.6/1M).

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGGPT-5.6 Luna

Larger window (1.1M).

Screenshots / visionGPT-5.6 Luna

GPT-5.6 Luna is the side marked multimodal in the catalog.

Target WorkloadRecommended PickEvaluation Rationale
Repo / coding agentsinsufficient dataNeed SWE-bench on both sides.
High-volume chatGPT-5.6 LunaLower output list price ($0.6/1M).
Voice / low-latency UIinsufficient dataNeed TTFT on both sides.
Long-document RAGGPT-5.6 LunaLarger window (1.1M).
Screenshots / visionGPT-5.6 LunaGPT-5.6 Luna is the side marked multimodal in the catalog.

Related Editorial Dispatches & Benchmark Notes

View all news
priceJul 30, 2026

GPT-5.6 Luna’s 80% cut: $0.20/$1.20 for volume chat

Luna is the OpenAI fast/cheap 5.6 SKU after Jul 30. It is not Sol. Sort by price and TTFT, not Elo.

launchAug 8, 2025

GPT-5 mini: the 2025 distill still useful as a cheap OpenAI baseline

High-volume agents that cannot pay Sol. Compare to Luna before you assume the new cheap SKU wins.

Community Sentiment

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CompareLLM Matrix

Verified head-to-head card

LIVE
VS
OpenAI

GPT-5.6 Luna

Elo 1,466
LiveBench64.2%
SWE-bench61.8%
Speed188 tok/s
Output cost$0.6/1M
Mistral

Mistral: Mistral Small 4

Elo n/a
LiveBench—
SWE-bench—
Speed—
Output cost$0.6/1M

Frequently Asked Questions

Which is better overall, GPT-5.6 Luna or Mistral: Mistral Small 4?
We do not have preference Elo for both models, so we do not declare an overall winner. Compare the metrics that exist.
Which is better at coding, GPT-5.6 Luna or Mistral: Mistral Small 4?
SWE-bench is missing for at least one model, so we do not rank coding from a single number.
Which is cheaper to run in production?
GPT-5.6 Luna output tokens are $0.6/1M versus $0.6/1M. Input prices and retry rates still move the real bill.
Which is faster, GPT-5.6 Luna or Mistral: Mistral Small 4?
We do not have TTFT for both models.
Which has the larger context window?
GPT-5.6 Luna accepts 1.1M tokens versus 262k.
Can I self-host either model?
Neither model is marked open-weights here. You are comparing hosted APIs.
Are these scores from CompareLLM’s own evals?
No. V1 aggregates public leaderboards (and optional first-party latency pings). Each cell names its source and date. Read /methodology.
What does preference Elo mean on this page?
Preference Elo is a crowd vote from LMArena / Arena. People see two hidden answers and pick the one they like more. The model that wins more often gets a higher Elo. That means people preferred it — not that it passed a school test. It is not SWE-bench, not accuracy, and not a number we invent. GPT-5.6 Luna and Mistral: Mistral Small 4 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Related news

  • price · Jul 30, 2026

    GPT-5.6 Luna’s 80% cut: $0.20/$1.20 for volume chat

  • launch · Aug 8, 2025

    GPT-5 mini: the 2025 distill still useful as a cheap OpenAI baseline

Similar Head-to-Head Comparisons

All GPT-5.6 Luna matchups →|All Mistral: Mistral Small 4 matchups →
GPT-5.6 Luna vs GPT-5 mini (previous gpt-mini)Mistral Large 3 vs GPT-5.6 LunaGPT-4.5 Orion vs GPT-5.6 LunaGPT-5.6 Terra vs GPT-5.6 LunaGPT-5 vs GPT-5.6 LunaGPT-5.6 Sol vs GPT-5.6 Luna