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Model compare

GPT-5.2 vs GPT-5.6 Luna

The readout for GPT-5.2 and GPT-5.6 Luna, before the detailed comparison sheet.

Model A

GPT-5.2

OpenAI

Contender
vs

Model B

GPT-5.6 Luna

OpenAI

Leading

Key Takeaways

Weighted outcome: GPT-5.6 Luna. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

GPT-5.6 Luna

GPT-5.6 Luna has the higher weighted result; Model A / B score 25.3 to 74.7.

Evidence depth

119 data points

Includes 27 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with GPT-5.6 Luna

The charts below split 37 high-signal samples across speed, scores, and audit health.

Change comparison

Switch either side of this report to compare another model with the same LMSpeed data pipeline.

Select a different model to open a new comparison URL.

Comparison sheet

This report only uses LMSpeed data for GPT-5.2 and GPT-5.6 Luna: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare
GPT-5.2
GPT-5.6 Luna
Overall leaderContenderLeading
Weighted overall score25.3 pts74.7 pts
Benchmark category leads1 categories5 categories
Operational advantagesFirst-token latency, Free providers, Provider coverageCheapest input price, Average speed
Context window400K tokens1.1M tokens
Max output128K tokens128K tokens
Modalities

Input

FileImageText

Output

Text

Input

FileImageText

Output

Text
Features
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning
Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning

The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.

Model metadata

Model compare
GPT-5.2
GPT-5.6 Luna
DeveloperOpenAIOpenAI
ReleasedDec 2025Jul 2026
ParametersNo dataNo data
TokenizerGPTGPT
Knowledge cutoffNo data2026-02-16
OpenRouter IDopenai/gpt-5.2openai/gpt-5.6-luna
ReferencesNo dataNo data

When to choose each model

This report only uses LMSpeed data for GPT-5.2 and GPT-5.6 Luna: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

GPT-5.2

GPT-5.2 is stronger in benchmark categories (Knowledge) and operational dimensions (First-token latency, Free providers, Provider coverage).

GPT-5.6 Luna

GPT-5.6 Luna is stronger in benchmark categories (Agents, Coding, Reasoning, Math, Multimodal) and operational dimensions (Cheapest input price, Average speed).

Benchmark score comparison

Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.

Category performance

Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.

Model A coverage
7 / 8
Model B coverage
6 / 8
Shared
6 shared categories

Avg. score

GPT-5.2

52.4

Avg. score

GPT-5.6 Luna

56.5

Agents

GPT-5.6 Luna leads by 10.7

GPT-5.247.6
GPT-5.6 Luna58.3

Coding

GPT-5.6 Luna leads by 0.5

GPT-5.256.2
GPT-5.6 Luna56.7

Reasoning

GPT-5.6 Luna leads by 1.0

GPT-5.253.5
GPT-5.6 Luna54.5

Knowledge

GPT-5.2 leads by 0.3

GPT-5.256.8
GPT-5.6 Luna56.5

Math

GPT-5.6 Luna leads by 6.5

GPT-5.255.9
GPT-5.6 Luna62.4

Multilingual

No data

GPT-5.2-
GPT-5.6 Luna-

Multimodal

GPT-5.6 Luna leads by 8.0

GPT-5.242.3
GPT-5.6 Luna50.3

Instruction following

GPT-5.2

GPT-5.254.4
GPT-5.6 Luna-

Professional benchmark details

Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.

Aggregatereported

BenchLM overall score

SourceGPT-5.2

GPT-5.2

52.0

Rank #69/100 · confidence 3 · eval date 2025-12-11

+18.0

GPT-5.6 Luna

winner

70.0

Rank #19/100 · confidence 3 · eval date 2026-07-09

Pricingverified

Input price

SourceGPT-5.2 (Non-reasoning)

GPT-5.2

$1.75/M

Rank #135/179 · confidence 4

+$1.55/M

GPT-5.6 Luna

winner

$0.200/M

Rank #32/179 · confidence 4

Pricingverified

Blended price

SourceGPT-5.2 (Non-reasoning)

GPT-5.2

$4.81/M

Rank #150/179 · confidence 4

+$4.36/M

GPT-5.6 Luna

winner

$0.450/M

Rank #42/179 · confidence 4

Pricingverified

Output price

SourceGPT-5.2 (Non-reasoning)

GPT-5.2

$14.00/M

Rank #151/179 · confidence 4

+$12.80/M

GPT-5.6 Luna

winner

$1.20/M

Rank #48/179 · confidence 4

Reasoningreported

AA-LCR

SourceGPT-5.2

GPT-5.2

winner

79.3

Rank #8/100 · confidence 3 · eval date 2025-12-11

+1.0

GPT-5.6 Luna

78.3

Rank #13/100 · confidence 3 · eval date 2026-07-09

Reasoningreported

ARC-AGI-2

SourceGPT-5.2

GPT-5.2

52.9

Rank #13/17 · confidence 3 · eval date 2025-12-11

+6.6

GPT-5.6 Luna

winner

59.5

Rank #11/17 · confidence 3 · eval date 2026-07-09

Reasoningreported

CritPt

SourceGPT-5.2

GPT-5.2

11.6

Rank #27/83 · confidence 3 · eval date 2025-12-11

+9.0

GPT-5.6 Luna

winner

20.6

Rank #12/83 · confidence 3 · eval date 2026-07-09

Reasoningverified

GPQA

SourceGPT-5.2 (Non-reasoning)

GPT-5.2

71.2%

Rank #132/211 · confidence 4

+19.9%

GPT-5.6 Luna

winner

91.1%

Rank #21/211 · confidence 4

Reasoningreported

BenchLM Reasoning score

SourceGPT-5.2

GPT-5.2

50.8

Rank #25/29 · confidence 3 · eval date 2025-12-11

+7.0

GPT-5.6 Luna

winner

57.8

Rank #23/29 · confidence 3 · eval date 2026-07-09

Reasoningverified

HLE

SourceGPT-5.2 (Non-reasoning)

GPT-5.2

8.0%

Rank #126/208 · confidence 4

+31.5%

GPT-5.6 Luna

winner

39.5%

Rank #27/208 · confidence 4

Codingreported

SWE-bench Pro

SourceGPT-5.2

GPT-5.2

55.6

Rank #32/49 · confidence 3 · eval date 2025-12-11

+7.1

GPT-5.6 Luna

winner

62.7

Rank #10/49 · confidence 3 · eval date 2026-07-09

Codingverified

SciCode

SourceGPT-5.2 (Non-reasoning)

GPT-5.2

40.4%

Rank #79/204 · confidence 4

+12.1%

GPT-5.6 Luna

winner

52.5%

Rank #21/204 · confidence 4

Codingreported

AA-SciCode

SourceGPT-5.2

GPT-5.2

52.1

Rank #25/108 · confidence 3 · eval date 2025-12-11

+0.4

GPT-5.6 Luna

winner

52.5

Rank #24/108 · confidence 3 · eval date 2026-07-09

Codingreported

BenchLM Coding score

SourceGPT-5.2

GPT-5.2

56.4

Rank #43/81 · confidence 3 · eval date 2025-12-11

+1.1

GPT-5.6 Luna

winner

57.5

Rank #37/81 · confidence 3 · eval date 2026-07-09

Mathreported

BenchLM Math score

SourceGPT-5.2

GPT-5.2

58.3

Rank #29/62 · confidence 3 · eval date 2025-12-11

+38.6

GPT-5.6 Luna

winner

96.9

Rank #1/62 · confidence 3 · eval date 2026-07-09

Mathreported

FrontierMath v2 (Tier 4)

SourceGPT-5.2

GPT-5.2

18.8

Rank #11/35 · confidence 3 · eval date 2025-12-11

+39.7

GPT-5.6 Luna

winner

58.5

Rank #3/35 · confidence 3 · eval date 2026-07-09

Mathreported

FrontierMath v2 (Tiers 1-3)

SourceGPT-5.2

GPT-5.2

40.7

Rank #10/47 · confidence 3 · eval date 2025-12-11

+37.9

GPT-5.6 Luna

winner

78.6

Rank #3/47 · confidence 3 · eval date 2026-07-09

Knowledgereported

AA-Omniscience Hallucination Rate

SourceGPT-5.2

GPT-5.2

81.2

Rank #40/101 · confidence 3 · eval date 2025-12-11

+11.4

GPT-5.6 Luna

winner

92.6

Rank #10/101 · confidence 3 · eval date 2026-07-09

Knowledgereported

BenchLM Knowledge score

SourceGPT-5.2

GPT-5.2

81.6

Rank #13/69 · confidence 3 · eval date 2025-12-11

0.0

GPT-5.6 Luna

81.6

Rank #13/69 · confidence 3 · eval date 2026-07-09

Knowledgereported

AA-GPQA Diamond

SourceGPT-5.2

GPT-5.2

90.3

Rank #27/108 · confidence 3 · eval date 2025-12-11

+0.8

GPT-5.6 Luna

winner

91.1

Rank #21/108 · confidence 3 · eval date 2026-07-09

Knowledgereported

Artificial Analysis Intelligence Index

SourceGPT-5.2

GPT-5.2

43.3

Rank #29/111 · confidence 3 · eval date 2025-12-11

+7.9

GPT-5.6 Luna

winner

51.2

Rank #21/111 · confidence 3 · eval date 2026-07-09

Knowledgereported

AA-Omniscience Accuracy

SourceGPT-5.2

GPT-5.2

winner

44.3

Rank #24/101 · confidence 3 · eval date 2025-12-11

+1.6

GPT-5.6 Luna

42.7

Rank #25/101 · confidence 3 · eval date 2026-07-09

Knowledgereported

AA-HLE

SourceGPT-5.2

GPT-5.2

37.7

Rank #28/108 · confidence 3 · eval date 2025-12-11

+1.8

GPT-5.6 Luna

winner

39.5

Rank #25/108 · confidence 3 · eval date 2026-07-09

Multimodalreported

MMMU-Pro

SourceGPT-5.2

GPT-5.2

winner

79.5

Rank #11/31 · confidence 3 · eval date 2025-12-11

+1.1

GPT-5.6 Luna

78.4

Rank #17/31 · confidence 3 · eval date 2026-07-09

Multimodalreported

BenchLM Multimodal Grounded score

SourceGPT-5.2

GPT-5.2

winner

68.9

Rank #17/44 · confidence 3 · eval date 2025-12-11

+2.9

GPT-5.6 Luna

66.0

Rank #24/44 · confidence 3 · eval date 2026-07-09

Agentsreported

BenchLM Agentic score

SourceGPT-5.2

GPT-5.2

22.1

Rank #64/69 · confidence 3 · eval date 2025-12-11

+62.9

GPT-5.6 Luna

winner

85.0

Rank #8/69 · confidence 3 · eval date 2026-07-09

Agentsreported

BrowseComp

SourceGPT-5.2

GPT-5.2

65.8

Rank #24/31 · confidence 3 · eval date 2025-12-11

+17.5

GPT-5.6 Luna

winner

83.3

Rank #13/31 · confidence 3 · eval date 2026-07-09

API audit comparison

Latest completed audits from shared providers, with four safety and integrity score groups plus report links.

Provider
GPT-5.2
GPT-5.6 Luna
No completed audits are available from shared providers yet.

Provider examples

Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.

Provider
GPT-5.2
GPT-5.6 Luna
N1N15 tests

GPT-5.2

speed / latency

56 tok/s / 1798ms

input / output

No data

GPT-5.6 Luna

speed / latency

N/A / N/A

input / output

No data

OpenCode10 tests

GPT-5.2

speed / latency

N/A / N/A

input / output

No data

GPT-5.6 Luna

speed / latency

2042 tok/s / 2791ms

input / output

No data

PackyAPI10 tests

GPT-5.2

speed / latency

94 tok/s / 11492ms

input / output

No data

GPT-5.6 Luna

speed / latency

N/A / N/A

input / output

No data

BUZZ5 tests

GPT-5.2

speed / latency

64 tok/s / 3553ms

input / output

No data

GPT-5.6 Luna

speed / latency

N/A / N/A

input / output

No data

IKunCode5 tests

GPT-5.2

speed / latency

N/A / N/A

input / output

No data

GPT-5.6 Luna

speed / latency

40 tok/s / 13897ms

input / output

No data

180txt API

GPT-5.2

gpt-5.2-2025-12-11

speed / latency

No data

input / output

$0/M/$0/M

GPT-5.6 Luna

gpt-5.6-luna

speed / latency

No data

input / output

$0.730/M/$4.38/M

APIMart

GPT-5.2

gpt-5.2

speed / latency

No data

input / output

$1.34/M/$10.74/M

GPT-5.6 Luna

gpt-5.6-luna

speed / latency

No data

input / output

$0/M/$0/M

Moyanjdc API

GPT-5.2

gpt-5.2-openai-compact

speed / latency

No data

input / output

$0/M/$0/M

GPT-5.6 Luna

gpt-5.6-luna

speed / latency

No data

input / output

$0/M/$0/M

兔子API

GPT-5.2

gpt-5.2

speed / latency

No data

input / output

$0/request

GPT-5.6 Luna

gpt-5.6-luna

speed / latency

No data

input / output

$0/request

Yun API

GPT-5.2

gpt-5.2

speed / latency

No data

input / output

$0.0027/request

GPT-5.6 Luna

gpt-5.6-luna

speed / latency

No data

input / output

$0.034/M/$0.205/M

FAQ

Weighted outcome: GPT-5.6 Luna. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Why is this comparison indexable?
It has 6 verifiable comparison points, and both models have pricing or benchmark data.
Are missing metrics invented?
No. Metrics without LMSpeed data are omitted from this report.

Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.