Pairwise benchmark snapshot · Aug 1, 2026

FLUX.1 [dev] vs GPT Image 1.5 benchmark

Name: FLUX.1 [dev] vs GPT Image 1.5 AI benchmark comparison
Creator: CompareLLM
License: https://creativecommons.org/licenses/by/4.0/

Comparing verified benchmark accuracy, speed, and token pricing between FLUX.1 [dev] and GPT Image 1.5. Review the complete breakdown below to determine which model best fits your performance and budget requirements.

Share Analysis:

Verified Head-to-Head Advantage Breakdown

5 direct benchmark disciplines evaluated across capability, speed, and cost

FLUX.1 [dev] (1)GPT Image 1.5 (4)

FLUX.1 [dev]

1 of 5 Wins

✓Price per 1k images

GPT Image 1.5

4 of 5 Wins

✓Image Elo✓Generation time✓Prompt adherence✓Text rendering

Black Forest Labs

Leads 1 of 5 metrics

FLUX.1 [dev]

Open-weights non-commercial base model with 12B parameters, serving as the foundation for the open-source fine-tuning ecosystem.

Open Dev 12BImg Elo 1,180$30/1k imgs

OpenAI

Leads 4 of 5 metrics

GPT Image 1.5

Previous OpenAI image generation flagship. High fidelity with proven enterprise reliability.

Img Elo 1,313$133/1k imgs

FLUX.1 Series Lineage & Sibling Variants

3 models

Currently comparing FLUX.1 [dev] vs GPT Image 1.5. Alternative family tiers available.

Active: FLUX.1 [dev]

FLUX.1.1 [pro]$50/1k FLUX.1 [schnell]$15/1k

Top Rival Showdowns for FLUX.1 [dev]

All Matchups

Compare vs:vs GPT Image 2 (High)vs Reve 2.1 vs Nano Banana Pro (Gemini 3 Pro Image)vs Ideogram 4.0 (Quality)vs Recraft V4.1 Utility Pro

Image Quality LeaderGPT Image 1.5 Wins

GPT Image 1.5

Δ 133 Image Elo pts

Generation Speed LeaderGPT Image 1.5 Wins

GPT Image 1.5

3.5s per render

Value per Dollar LeaderFLUX.1 [dev] Wins

FLUX.1 [dev]

$30/1k images

Head-to-Head Comparison

Overall Matchup Breakdown

Category wins across reasoning intelligence, generation speed, and token cost.

FLUX.1 [dev] (1)vsGPT Image 1.5 (4)

FLUX.1 [dev]: 1W (20%)Overall: GPT Image 1.5GPT Image 1.5: 4W (80%)

← FLUX.1 [dev]GPT Image 1.5 →

🏆GPT Image 1.5(3/3)

Visual Quality & Adherence

Arena Preference Elo, prompt fidelity & typography score

Benchmark

FLUX.1 [dev]vsGPT Image 1.5

Image Elo

1,180vs1,313+133

Prompt adherence

87.5%vs91%+3.5%

Text rendering

86%vs90.5%+4.5%

FLUX.1 [dev]: 0WGPT Image 1.5: 3W

🏆GPT Image 1.5(1/1)

Generation Latency

Time to render full-resolution image snapshot (seconds)

Benchmark

FLUX.1 [dev]vsGPT Image 1.5

Generation time

4svs3.5s+0.5s

FLUX.1 [dev]: 0WGPT Image 1.5: 1W

🏆FLUX.1 [dev](1/1)

Cost Efficiency

API inference cost per 1,000 generated images

Benchmark

FLUX.1 [dev]vsGPT Image 1.5

Price per 1k images

$30/1kvs$133/1k+$103/1k

FLUX.1 [dev]: 1WGPT Image 1.5: 0W

Side-by-Side Benchmark Matrix

Image Elo+133

FLUX.1 [dev]1,180

seed-bootstrap · Aug 1, 2026

GPT Image 1.51,313

seed-bootstrap · Aug 1, 2026

Generation time+0.5s

FLUX.1 [dev]4s

seed-bootstrap · Aug 1, 2026

GPT Image 1.53.5s

seed-bootstrap · Aug 1, 2026

Price per 1k images+$103/1k

FLUX.1 [dev]$30/1k

seed-bootstrap · Aug 1, 2026

GPT Image 1.5$133/1k

seed-bootstrap · Aug 1, 2026

Prompt adherence+3.5%

FLUX.1 [dev]87.5%

seed-bootstrap · Aug 1, 2026

GPT Image 1.591%

seed-bootstrap · Aug 1, 2026

Text rendering+4.5%

FLUX.1 [dev]86%

seed-bootstrap · Aug 1, 2026

GPT Image 1.590.5%

seed-bootstrap · Aug 1, 2026

Benchmark	FLUX.1 [dev]	GPT Image 1.5	Advantage Delta
Image Elo	1,180 seed-bootstrap · Aug 1, 2026	1,313 seed-bootstrap · Aug 1, 2026	+133
Generation time	4s seed-bootstrap · Aug 1, 2026	3.5s seed-bootstrap · Aug 1, 2026	+0.5s
Price per 1k images	$30/1k seed-bootstrap · Aug 1, 2026	$133/1k seed-bootstrap · Aug 1, 2026	+$103/1k
Prompt adherence	87.5% seed-bootstrap · Aug 1, 2026	91% seed-bootstrap · Aug 1, 2026	+3.5%
Text rendering	86% seed-bootstrap · Aug 1, 2026	90.5% seed-bootstrap · Aug 1, 2026	+4.5%

Interactive Simulator (USD)

Workload Cost & Savings Calculator

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

Save up to 77% with FLUX.1 [dev]

Monthly Image Production Volume25k images / month (25000 imgs)

Quick Presets:

FLUX.1 [dev]$750.00 / mo

Rate: $30/1k

GPT Image 1.5$3,325.00 / mo

Rate: $133/1k

Estimated Cost Delta

FLUX.1 [dev] is estimated to save $2,575.00/month ($30,900/year).

Based on 25k images generated

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatinsufficient data

Need list prices.

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGinsufficient data

Need context sizes.

Screenshots / visioninsufficient data

Both accept images. Defaulting to the higher-Elo side (undefined).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	insufficient data	Need SWE-bench on both sides.
High-volume chat	insufficient data	Need list prices.
Voice / low-latency UI	insufficient data	Need TTFT on both sides.
Long-document RAG	insufficient data	Need context sizes.
Screenshots / vision	insufficient data	Both accept images. Defaulting to the higher-Elo side (undefined).

Community Sentiment

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Community Discussions (0)

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CompareLLM AI Matrix

Verified Head-to-Head Telemetry

LIVE BENCHMARK

Black Forest Labs

FLUX.1 [dev]

Elo n/a

SWE-bench—

Speed (tok/s)—

Input / 1M Tokens$30/1k

Output / 1M Tokens$30/1k

OpenAI

GPT Image 1.5

Elo n/a

SWE-bench—

Speed (tok/s)—

Input / 1M Tokens$133/1k

Output / 1M Tokens$133/1k

Frequently Asked Questions

Which is better overall, FLUX.1 [dev] or GPT Image 1.5?: 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, FLUX.1 [dev] or GPT Image 1.5?: 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?: List prices are missing for at least one model.
Which is faster, FLUX.1 [dev] or GPT Image 1.5?: We do not have TTFT for both models.
Which has the larger context window?: Context window is missing for at least one model.
Can I self-host either model?: FLUX.1 [dev] is marked open-weights in our catalog. The other side is a closed API. Check the provider license before you ship weights.
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. FLUX.1 [dev] and GPT Image 1.5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.

Similar Head-to-Head Comparisons

All FLUX.1 [dev] matchups →|All GPT Image 1.5 matchups →

FLUX.1 [dev] vs FLUX.1 [schnell] (next flux)GPT Image 1.5 vs DALL-E 3 (previous gpt-image)GPT Image 1.5 vs GPT Image 2 (High) (next gpt-image)FLUX.2 [max] vs GPT Image 1.5 FLUX.2 [flex] vs GPT Image 1.5 GPT Image 2 (Low / Fast) vs GPT Image 1.5

Benchmark

FLUX.1 [dev]

GPT Image 1.5

Advantage Delta

Image Elo

1,180

seed-bootstrap · Aug 1, 2026

1,313

seed-bootstrap · Aug 1, 2026

+133

Generation time

seed-bootstrap · Aug 1, 2026

3.5s

seed-bootstrap · Aug 1, 2026

+0.5s

Price per 1k images

$30/1k

seed-bootstrap · Aug 1, 2026

$133/1k

seed-bootstrap · Aug 1, 2026

+$103/1k

Prompt adherence

87.5%

seed-bootstrap · Aug 1, 2026

91%

seed-bootstrap · Aug 1, 2026

+3.5%

Text rendering

86%

seed-bootstrap · Aug 1, 2026

90.5%

seed-bootstrap · Aug 1, 2026

+4.5%

Recommended Workload Routing

Repo / coding agentsinsufficient data

Need SWE-bench on both sides.

High-volume chatinsufficient data

Need list prices.

Voice / low-latency UIinsufficient data

Need TTFT on both sides.

Long-document RAGinsufficient data

Need context sizes.

Screenshots / visioninsufficient data

Both accept images. Defaulting to the higher-Elo side (undefined).

Target Workload	Recommended Pick	Evaluation Rationale
Repo / coding agents	insufficient data	Need SWE-bench on both sides.
High-volume chat	insufficient data	Need list prices.
Voice / low-latency UI	insufficient data	Need TTFT on both sides.
Long-document RAG	insufficient data	Need context sizes.
Screenshots / vision	insufficient data	Both accept images. Defaulting to the higher-Elo side (undefined).

Frequently Asked Questions

Which is better overall, FLUX.1 [dev] or GPT Image 1.5?

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, FLUX.1 [dev] or GPT Image 1.5?

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?

List prices are missing for at least one model.

Which is faster, FLUX.1 [dev] or GPT Image 1.5?

We do not have TTFT for both models.

Which has the larger context window?

Context window is missing for at least one model.

Can I self-host either model?

FLUX.1 [dev] is marked open-weights in our catalog. The other side is a closed API. Check the provider license before you ship weights.

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. FLUX.1 [dev] and GPT Image 1.5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.