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.

Back to models

Data points: 123

Model compare

Gemini 2.5 Pro vs GPT-5.4

The readout for Gemini 2.5 Pro and GPT-5.4, before the detailed comparison sheet.

Model A

Gemini 2.5 Pro

Google

Contender

Model B

GPT-5.4

OpenAI

Leading

Key Takeaways

Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.

Decision read

GPT-5.4

GPT-5.4 has the higher weighted result; Model A / B score 4 to 96.

Evidence depth

123 data points

Includes 29 benchmark rows, 0 audit samples, and 10 provider examples.

Selection signal

Start with GPT-5.4

The charts below split 39 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

Comparison sheet

This report only uses LMSpeed data for Gemini 2.5 Pro and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Model compare	Gemini 2.5 Pro	GPT-5.4
Overall leader	Contender	Leading
Weighted overall score	4.0 pts	96.0 pts
Benchmark category leads	0 categories	6 categories
Operational advantages	Average speed	Cheapest input price, First-token latency, Free providers, Provider coverage
Context window	1.0M tokens	1.1M tokens
Max output	65.5K tokens	128K tokens
Modalities	Input TextImageFileAudiovideo Output Text	Input TextImageFile Output Text
Features	Text inputImage inputFile inputAudio 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	Gemini 2.5 Pro	GPT-5.4
Developer	Google	OpenAI
Released	Jun 2025	Mar 2026
Parameters	No data	No data
Tokenizer	Gemini	GPT
Knowledge cutoff	2025-01-31	No data
OpenRouter ID	google/gemini-2.5-pro	openai/gpt-5.4
References	No data	No data

When to choose each model

This report only uses LMSpeed data for Gemini 2.5 Pro and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.

Gemini 2.5 Pro

Gemini 2.5 Pro has these operational advantages: Average speed.

GPT-5.4

GPT-5.4 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (Cheapest input price, First-token latency, Free providers, Provider coverage).

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: 7 / 8
Shared: 6 shared categories

Avg. score

Gemini 2.5 Pro

45.7

Avg. score

GPT-5.4

56.6

Agents

GPT-5.4 leads by 12.3

Gemini 2.5 Pro44

GPT-5.456.3

Coding

GPT-5.4 leads by 23.4

Gemini 2.5 Pro38.8

GPT-5.462.2

Reasoning

GPT-5.4 leads by 2.1

Gemini 2.5 Pro53.6

GPT-5.455.7

Knowledge

GPT-5.4 leads by 22.7

Gemini 2.5 Pro35.8

GPT-5.458.5

Math

GPT-5.4 leads by 0.8

Gemini 2.5 Pro56

GPT-5.456.8

Multilingual

No data

Gemini 2.5 Pro-

GPT-5.4-

Multimodal

GPT-5.4

Gemini 2.5 Pro-

GPT-5.452.5

Instruction following

GPT-5.4 leads by 8.0

Gemini 2.5 Pro46

GPT-5.454

Professional benchmark details

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

Group

Aggregatereported

Provider	Gemini 2.5 Pro	GPT-5.4
天宫造物50 tests	Gemini 2.5 Pro speed / latency N/A / N/A input / output No data	GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data
CatClaw API30 tests	Gemini 2.5 Pro speed / latency 48 tok/s / 23637ms input / output No data	GPT-5.4 speed / latency N/A / N/A input / output No data
6345ywz API15 tests	Gemini 2.5 Pro speed / latency N/A / N/A input / output No data	GPT-5.4 speed / latency 41 tok/s / 6581ms input / output No data
0CHAT10 tests	Gemini 2.5 Pro speed / latency N/A / N/A input / output No data	GPT-5.4 speed / latency 51 tok/s / 2526ms input / output No data
Fengsili API10 tests	Gemini 2.5 Pro speed / latency N/A / N/A input / output No data	GPT-5.4 speed / latency 88 tok/s / 6075ms input / output No data
APIMart	Gemini 2.5 Pro gemini-2.5-pro-nothinking speed / latency No data input / output $0.959/M/$7.67/M	GPT-5.4 gpt-5.4 speed / latency No data input / output $0/M/$0/M
兔子API	Gemini 2.5 Pro gemini-2.5-pro-preview-03-25 speed / latency No data input / output $0/request	GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $0/request
云AI	Gemini 2.5 Pro gemini-2.5-pro-c speed / latency No data input / output $0.0010/request	GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $0.068/M/$0.411/M
KFCV50	Gemini 2.5 Pro gemini-2.5-pro speed / latency No data input / output $0.0052/request	GPT-5.4 gpt-5.4 speed / latency No data input / output $0.014/request
PoloAPI	Gemini 2.5 Pro gemini-2.5-pro-c speed / latency No data input / output $0.0055/request	GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0.514/M/$3.08/M

Comparison sheet

Model metadata

When to choose each model

Benchmark score comparison

Category performance

Agents

Coding

Reasoning

Knowledge

Math

Multilingual

Multimodal

Instruction following

Professional benchmark details

BenchLM overall score

Input price

Blended price

Output price

CritPt

AA-LCR

GPQA

HLE

Vibe Code Bench

AA-SciCode

AA Coding Index

BenchLM Coding score

FrontierMath v2 (Tiers 1-3)

FrontierMath v2 (Tier 4)

BenchLM Math score

AA-Omniscience Hallucination Rate

AA-HLE

AA-Omniscience Accuracy

AA-GPQA Diamond

Artificial Analysis Intelligence Index

BenchLM Knowledge score

AA-MMMU-Pro

Design Arena Website

AA-IFBench

τ²-bench results

Gert Labs

AA Agentic Index

GDPval-AA

GDPval-AA

API audit comparison

Provider examples

FAQ

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