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AI model comparison

Kimi K2.5 vs GPT-5.1 Codex mini

Compare pricing, context limits, supported inputs and deployment options to choose a model for your workflow.

Kimi K2.5 from Moonshot AI lists 262.14K context, 262.14K maximum output, $0.60 input per 1M tokens, $3.00 output per 1M tokens. GPT-5.1 Codex mini from OpenAI lists 400K context, 128K maximum output, $0.25 input per 1M tokens, $2.00 output per 1M tokens. Compare the inputs, outputs and deployment options below to see which fits your workflow.

Side-by-sideCapabilities and practical differences

Moonshot AI

Kimi K2.5

Kimi K2.5 from Moonshot AI: Earlier Kimi frontier model for long-context agents, coding, and multimodal work.

Context
262.14K
Max output
262.14K
Input / 1M tokens
$0.60
Output / 1M tokens
$3.00

Accepts

  • Text input
  • Image input
  • Video input

Produces

  • Text output
Full model profilegithub.com ↗
VS

OpenAI

GPT-5.1 Codex mini

GPT-5.1 Codex mini from OpenAI: Coding-optimized GPT model for repository edits, reviews, and agentic software work.

Context
400K
Max output
128K
Input / 1M tokens
$0.25
Output / 1M tokens
$2.00

Accepts

  • Text input
  • Image input

Produces

  • Text output
Full model profilegithub.com ↗

At a glance

Key differences

Compare the available figures below, then try both models on the work you need to do.

Kimi K2.5

  • Maximum output: 262.14K

GPT-5.1 Codex mini

  • Context capacity: 400K
  • Input price: $0.25
  • Output price: $2.00

Context capacity

Higher listed limit

Kimi K2.5:262.14K

GPT-5.1 Codex mini:400K

GPT-5.1 Codex mini

Maximum output

Higher listed limit

Kimi K2.5:262.14K

GPT-5.1 Codex mini:128K

Kimi K2.5

Input price

Lower listed token rate

Kimi K2.5:$0.60

GPT-5.1 Codex mini:$0.25

GPT-5.1 Codex mini

Output price

Lower listed token rate

Kimi K2.5:$3.00

GPT-5.1 Codex mini:$2.00

GPT-5.1 Codex mini

Specifications

Pricing, limits and capabilities

Specifications for Kimi K2.5 and GPT-5.1 Codex mini. Higher limits and lower prices describe these figures only.
SpecificationKimi K2.5GPT-5.1 Codex mini
ProviderMoonshot AIOpenAI
Listed pricing routeMoonshot AIOpenAI
Model familykimi-k2gpt-codex
Accepted inputstext, image, videotext, image
Produced outputstexttext
Context window262.14K400KHigher
Max output262.14KHigher128K
Input price / 1M$0.60$0.25Lower
Output price / 1M$3.00$2.00Lower
Reasoning modeDocumentedDocumented
Tool callingDocumentedDocumented
Image inputDocumentedDocumented
Audio inputNot documentedNot documented
Structured outputDocumentedDocumented
LicenseOpen weightsProprietary

Workload guidance

Which model should you choose?

Consider Kimi K2.5 if you need larger maximum output. Consider GPT-5.1 Codex mini if you need larger context or a lower listed input rate or a lower listed output rate. Kimi K2.5 offers downloadable weights; GPT-5.1 Codex mini is listed as a proprietary model. Compare licence terms and operating costs before choosing a deployment. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Documentation and model profiles

Explore each model’s features, API requirements and licence terms in the sources below.

Questions people ask

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

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