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

OpenAI: GPT-5.1-Codex vs GPT Image 1.5 benchmark

Name: OpenAI: GPT-5.1-Codex 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 OpenAI: GPT-5.1-Codex and GPT Image 1.5. Review the complete breakdown below to determine which model best fits your performance and budget requirements.

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Executive Verdict Summary

OpenAI: GPT-5.1-Codex holds empirical advantage (0 of 0 metrics)

Coding / SWESWE-bench

OpenAI: GPT-5.1-CodexTop code solve rate

ReasoningGPQA / Live

OpenAI: GPT-5.1-CodexTop logical accuracy

Best Value$/1M Tok

OpenAI: GPT-5.1-CodexLowest API billing cost

Speed / TokTok/Sec

OpenAI: GPT-5.1-CodexFastest stream rate

OpenAI

OpenAI: GPT-5.1-Codex

Auto-discovered from OpenRouter (openai/gpt-5.1-codex). Preview until a second source matches.

OpenAI

GPT Image 1.5

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

Img Elo 1,313$133/1k imgs

Top Rival Showdowns for OpenAI: GPT-5.1-Codex

All Matchups

Compare vs:vs Reve 2.1 vs Nano Banana Pro (Gemini 3 Pro Image)vs FLUX.2 [max]vs Ideogram 4.0 (Quality)vs Recraft V4.1 Utility Pro

Image Quality Leader

No shared data

Single model data

Generation Speed Leader

No shared data

No latency data

Value per Dollar Leader

No shared data

Unpriced

Overall Matchup Breakdown

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

OpenAI: GPT-5.1-Codex (0)vsGPT Image 1.5 (5)

OpenAI: GPT-5.1-Codex: 0W (0%)GPT Image 1.5: 5W (100%)

← OpenAI: GPT-5.1-CodexGPT Image 1.5 →

🏆GPT Image 1.5 Leads(3/3)

Visual Quality & Adherence

Arena Preference Elo, prompt fidelity & typography score

Benchmark

OpenAI: GPT-5.1-CodexvsGPT Image 1.5

Image Elo

—vs1,313

Prompt adherence

—vs91%

Text rendering

—vs90.5%

OpenAI: GPT-5.1-Codex: 0WGPT Image 1.5: 3W

🏆GPT Image 1.5 Leads(1/1)

Generation Latency

Time to render full-resolution image snapshot (seconds)

Benchmark

OpenAI: GPT-5.1-CodexvsGPT Image 1.5

Generation time

—vs3.5s

OpenAI: GPT-5.1-Codex: 0WGPT Image 1.5: 1W

🏆GPT Image 1.5 Leads(1/1)

Cost Efficiency

API inference cost per 1,000 generated images

Benchmark

OpenAI: GPT-5.1-CodexvsGPT Image 1.5

Price per 1k images

—vs$133/1k

OpenAI: GPT-5.1-Codex: 0WGPT Image 1.5: 1W

Side-by-Side Benchmark Matrix

OpenAI: GPT-5.1-CodexGPT Image 1.5

Image Elo

OpenAI: GPT-5.1-Codex—

GPT Image 1.51,313

Generation time

OpenAI: GPT-5.1-Codex—

GPT Image 1.53.5s

Price per 1k images

OpenAI: GPT-5.1-Codex—

GPT Image 1.5$133/1k

Prompt adherence

OpenAI: GPT-5.1-Codex—

GPT Image 1.591%

Text rendering

OpenAI: GPT-5.1-Codex—

GPT Image 1.590.5%

Benchmark	OpenAI: GPT-5.1-Codex	GPT Image 1.5	Advantage Delta
Image Elo	—	1,313 seed-bootstrap · Aug 1, 2026	—
Generation time	—	3.5s seed-bootstrap · Aug 1, 2026	—
Price per 1k images	—	$133/1k seed-bootstrap · Aug 1, 2026	—
Prompt adherence	—	91% seed-bootstrap · Aug 1, 2026	—
Text rendering	—	90.5% seed-bootstrap · Aug 1, 2026	—

Workload Cost & Savings Calculator

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

Save 100% with OpenAI: GPT-5.1-Codex

Monthly Image Production Volume25k images / month (25000 imgs)

Quick Presets:

OpenAI: GPT-5.1-Codex$0.00 / mo

Rate: $0/1k

GPT Image 1.5$3,325.00 / mo

Rate: $133/1k

Estimated Cost Delta

OpenAI: GPT-5.1-Codex is estimated to save $3,325.00/month ($39,900/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 / visionGPT Image 1.5

GPT Image 1.5 is the side marked multimodal in the catalog.

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	GPT Image 1.5	GPT Image 1.5 is the side marked multimodal in the catalog.

Cast Your Matchup Vote

0 total votes

Community Discussions (0)

No comments posted on this matchup yet. Be the first to share an evaluation note!

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CompareLLM AI Matrix

Verified Head-to-Head Telemetry

LIVE BENCHMARK

OpenAI

OpenAI: GPT-5.1-Codex

Elo n/a

SWE-bench—

Speed (tok/s)400k

Input / 1M Tokens$1.25/1M

Output / 1M Tokens$10/1M

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, OpenAI: GPT-5.1-Codex 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, OpenAI: GPT-5.1-Codex 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, OpenAI: GPT-5.1-Codex 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?: 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. OpenAI: GPT-5.1-Codex 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 OpenAI: GPT-5.1-Codex matchups →|All GPT Image 1.5 matchups →

GPT Image 1.5 vs DALL-E 3 (previous gpt-image)GPT Image 1.5 vs GPT Image 2 (High) (next gpt-image)GPT Image 2 (Low / Fast) vs GPT Image 1.5 Reve 2.1 vs GPT Image 1.5 Nano Banana Pro (Gemini 3 Pro Image) vs GPT Image 1.5 Nano Banana 2 (Gemini 3.1 Flash Image) vs GPT Image 1.5

Side-by-Side Benchmark Matrix

OpenAI: GPT-5.1-CodexGPT Image 1.5

Image Elo

OpenAI: GPT-5.1-Codex—

GPT Image 1.51,313

Generation time

OpenAI: GPT-5.1-Codex—

GPT Image 1.53.5s

Price per 1k images

OpenAI: GPT-5.1-Codex—

GPT Image 1.5$133/1k

Prompt adherence

OpenAI: GPT-5.1-Codex—

GPT Image 1.591%

Text rendering

OpenAI: GPT-5.1-Codex—

GPT Image 1.590.5%

Benchmark

OpenAI: GPT-5.1-Codex

GPT Image 1.5

Advantage Delta

Image Elo

—

1,313

seed-bootstrap · Aug 1, 2026

—

Generation time

—

3.5s

seed-bootstrap · Aug 1, 2026

—

Price per 1k images

—

$133/1k

seed-bootstrap · Aug 1, 2026

—

Prompt adherence

—

91%

seed-bootstrap · Aug 1, 2026

—

Text rendering

—

90.5%

seed-bootstrap · Aug 1, 2026

—

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 / visionGPT Image 1.5

GPT Image 1.5 is the side marked multimodal in the catalog.

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	GPT Image 1.5	GPT Image 1.5 is the side marked multimodal in the catalog.

Frequently Asked Questions

Which is better overall, OpenAI: GPT-5.1-Codex 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, OpenAI: GPT-5.1-Codex 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, OpenAI: GPT-5.1-Codex 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?

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. OpenAI: GPT-5.1-Codex and GPT Image 1.5 Elo cells are dated snapshots from the named source — we do not compute Arena ourselves.