Why is this comparison indexable?

It has 3 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.

Back to models

Data points: 40

Key Takeaways

The readout for GPT-5.4 and Kimi K2 0905, before the detailed comparison sheet.

Decision read

GPT-5.4

GPT-5.4 currently has the stronger profile, with verified wins split 3 to 0.

Evidence depth

40 data points

Includes 9 benchmark rows, 0 audit samples, and 0 provider examples.

Selection signal

Start with GPT-5.4

The charts below split 9 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.

Model AModel B

Select a different model to open a new comparison URL.

Model compare GPT-5.4 vs Kimi K2 0905 gpt-5-4-vs-kimi-k2-0905	Model A GPT-5.4	Model B Kimi K2 0905
Overall leader	Leading	Contender
Verified metric wins	3 wins	0 wins
Where it leads	Free providers, Provider coverage, Recent tests

Model compare

GPT-5.4 vs Kimi K2 0905

gpt-5-4-vs-kimi-k2-0905

Model A

GPT-5.4

Model B

Kimi K2 0905

Overall leader

Leading

Contender

Verified metric wins

3 wins

0 wins

Where it leads

Free providers, Provider coverage, Recent tests

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: 6 / 8
Model B coverage: 2 / 8
Shared: 2 shared categories

GPT-5.4Kimi K2 0905

Avg. score

GPT-5.4

63.6

Avg. score

Kimi K2 0905

50.5

Selected category

Coding

GPT-5.4 leads by 20.4

Professional benchmark details

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

Group

Performanceverified

Time to first answer token

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

winner

0.69 s

Rank #19/113 · confidence 4

+0.43 s

Kimi K2 0905

1.12 s

Rank #33/113 · confidence 4

Performanceverified

Time to first token

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

winner

0.69 s

Rank #24/113 · confidence 4

+0.43 s

Kimi K2 0905

1.12 s

Rank #50/113 · confidence 4

Performanceverified

Output speed

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

winner

106.7 tok/s

Rank #47/113 · confidence 4

+69.3 tok/s

Kimi K2 0905

37.3 tok/s

Rank #102/113 · confidence 4

Pricingverified

Output price

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

$15.00/M

Rank #116/138 · confidence 4

+$12.50/M

Kimi K2 0905

winner

$2.50/M

Rank #66/138 · confidence 4

Pricingverified

Blended price

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

$5.63/M

Rank #116/138 · confidence 4

+$4.55/M

Kimi K2 0905

winner

$1.07/M

Rank #67/138 · confidence 4

Pricingverified

Input price

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

$2.50/M

Rank #114/138 · confidence 4

+$1.90/M

Kimi K2 0905

winner

$0.600/M

Rank #68/138 · confidence 4

Reasoningverified

HLE

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

winner

10.6%

Rank #68/150 · confidence 4

+4.3%

Kimi K2 0905

6.3%

Rank #93/150 · confidence 4

Reasoningverified

GPQA

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

74.8%

Rank #75/152 · confidence 4

+1.9%

Kimi K2 0905

winner

76.7%

Rank #71/152 · confidence 4

Codingverified

SciCode

SourceGPT-5.4 (Non-reasoning)

GPT-5.4

winner

47.1%

Rank #13/149 · confidence 4

+16.4%

Kimi K2 0905

30.7%

Rank #107/149 · confidence 4

API audit comparison

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

Provider	GPT-5.4	Kimi K2 0905
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-5.4	Kimi K2 0905
No shared provider examples are available yet.

When to choose each model

This report only uses LMSpeed data for GPT-5.4 and Kimi K2 0905: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Guidance	GPT-5.4	Kimi K2 0905
When to choose each model	GPT-5.4 GPT-5.4 is stronger when you prioritize Free providers, Provider coverage, Recent tests.	Kimi K2 0905 Kimi K2 0905 does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing.

FAQ

TL;DR: GPT-5.4 leads across 40 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.

Why is this comparison indexable?: It has 3 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.

Continue from GPT-5.4 vs Kimi K2 0905 into nearby model comparisons with enough verified LMSpeed data.

Model metadata	GPT-5.4 exposes 1.1M tokens; notable signals: Text input, Image input, File input, Text output.	Kimi K2 0905 exposes 262.1K tokens; notable signals: Text input, Text output, Tool calling, Structured outputs.
Developer	OpenAI	MoonshotAI
Context window	1.1M tokens	262.1K tokens
Max output	128K tokens	100.4K tokens
Released	Mar 2026	No data
Modalities	Input TextImageFile Output Text	Input Text Output Text
Features	Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning	Text inputText outputTool callingStructured outputsJSON mode
Parameters	No data	No data
Tokenizer	GPT	Other
Knowledge cutoff	No data	2024-12-31
OpenRouter ID	openai/gpt-5.4	moonshotai/kimi-k2-0905
References	No data	No data

Key Takeaways

Change comparison

GPT-5.4 vs Kimi K2 0905

GPT-5.4

Kimi K2 0905

Benchmark score comparison

Category performance

Professional benchmark details

Time to first answer token

Time to first token

Output speed

Output price

Blended price

Input price

HLE

GPQA

SciCode

API audit comparison

Provider examples

When to choose each model

FAQ

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