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GPT-5.1-Codex-Max vs GPT-5.4 Image 2

GPT-5.1-Codex-Max costs 1.5x less per output token than GPT-5.4 Image 2 ($10.00 vs $15.00 per million). Updated October 21, 2026; no benchmark has tested both models yet.

Replace GPT-5.1-Codex-Max Replace GPT-5.4 Image 2
GPT-5.1-Codex-MaxOpenAI
Coding
No data
Overall
No data
Output $/M
$10.00
GPT-5.4 Image 2OpenAI
Coding
No data
Overall
No data
Output $/M
$15.00
vs $10.00 vs $15.00 per 1M output tokens. GPT-5.1-Codex-Max is 1.5x cheaper.

GPT-5.1-Codex-Max or GPT-5.4 Image 2: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick GPT-5.1-Codex-Max for output tokens 1.5x cheaper ($10.00 vs $15.00 per million) and a larger context window (400K against 272K tokens).

Model AGPT-5.1-Codex-MaxOpenAINot benchmarked1 independent benchmarkNo cost per solved taskModel BGPT-5.4 Image 2OpenAINot benchmarkedNo coding benchmarkNo cost per solved task

No benchmark has tested both yet. GPT-5.1-Codex-Max has results on LiveCodeBench (Vals AI), Vibe Code Bench (Vals AI) and Terminal-Bench; GPT-5.4 Image 2 has none yet. Compare them on price and context instead.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
GPT-5.1-Codex-Max not benchmarked, GPT-5.4 Image 2 not benchmarked.
Widest category
None yet: no category has been tested on both models.
Widest single gap
None yet: no benchmark has tested both models.
Output price
GPT-5.1-Codex-Max $10.00 against GPT-5.4 Image 2 $15.00 per million output tokens, 1.5x apart.
Context window
GPT-5.1-Codex-Max takes 400K tokens, GPT-5.4 Image 2 272K.

Benchmark by benchmark

Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.

CodingDirectional onlySix of these boards feed the Vibe Coding Index4 boards measured
Coding benchmarks for GPT-5.1-Codex-Max and GPT-5.4 Image 2
BenchmarkGPT-5.1-Codex-MaxGPT-5.4 Image 2Leader
LiveCodeBench (Vals AI)83.6%Not measuredOnly GPT-5.1-Codex-Max measured
Vibe Code Bench (Vals AI)22.2%Not measuredOnly GPT-5.1-Codex-Max measured
Terminal-Bench60.4%Not measuredOnly GPT-5.1-Codex-Max measured
ALE-Bench1228.3Not measuredOnly GPT-5.1-Codex-Max measured
Neither model has a result on the other 35 boards here
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
Agentic work benchmarks for GPT-5.1-Codex-Max and GPT-5.4 Image 2
BenchmarkGPT-5.1-Codex-MaxGPT-5.4 Image 2Leader
METR time horizons70.8%Not measuredOnly GPT-5.1-Codex-Max measured
Neither model has a result on the other 40 boards here
MathDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
Math benchmarks for GPT-5.1-Codex-Max and GPT-5.4 Image 2
BenchmarkGPT-5.1-Codex-MaxGPT-5.4 Image 2Leader
ProofBench9.0%Not measuredOnly GPT-5.1-Codex-Max measured
Neither model has a result on the other 12 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

GPT-5.1-Codex-Max$0.0063Fits in one request
GPT-5.4 Image 2$0.015Fits in one request

GPT-5.1-Codex-Max costs less

Repository review

50K input + 3K output tokens

GPT-5.1-Codex-Max$0.092Fits in one request
GPT-5.4 Image 2$0.445Fits in one request

GPT-5.1-Codex-Max costs less

Agent loop

200K input + 10K output tokens

GPT-5.1-Codex-Max$0.350Fits in one request
GPT-5.4 Image 2$1.75Fits in one request

GPT-5.1-Codex-Max costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of GPT-5.1-Codex-Max and GPT-5.4 Image 2
SpecificationOpenAI GPT-5.1-Codex-MaxOpenAI GPT-5.4 Image 2
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedDecember 4, 2025April 21, 2026
Context window400K272K
Input $/Mtok$1.25$8.00
Output $/Mtok$10.00$15.00
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it10
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.1-Codex-Max better than GPT-5.4 Image 2 for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5.1-Codex-Max for output tokens 1.5x cheaper ($10.00 vs $15.00 per million) and a larger context window (400K against 272K tokens).

Which is cheaper, GPT-5.1-Codex-Max or GPT-5.4 Image 2?

GPT-5.1-Codex-Max costs $1.25 per million input tokens and $10.00 per million output tokens; GPT-5.4 Image 2 costs $8.00 and $15.00. Cost per solved task is known for neither of them.

Which has the bigger context window, GPT-5.1-Codex-Max or GPT-5.4 Image 2?

GPT-5.1-Codex-Max, with 400K tokens against 272K.

Has any benchmark tested both GPT-5.1-Codex-Max and GPT-5.4 Image 2?

No benchmark has tested both yet. GPT-5.1-Codex-Max has results on LiveCodeBench (Vals AI), Vibe Code Bench (Vals AI) and Terminal-Bench; GPT-5.4 Image 2 has none yet. Compare them on price and context instead. Data as of October 21, 2026.

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