LLM Reference

GPT-5.5 Pro vs Kimi K2.7-Code

GPT-5.5 Pro (2026) and Kimi K2.7-Code (2026) compare a standalone API model against a coding-specialized model. GPT-5.5 Pro ships a 1.05m-token context window, while Kimi K2.7-Code ships a 262k-token context window. On GeneBench-Pro, GPT-5.5 Pro leads by 18.2 pts. On pricing, Kimi K2.7-Code costs $0.61/1M input tokens versus $30/1M for the alternative. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: GPT-5.5 Pro is standalone API model, while Kimi K2.7-Code is coding-specialized model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first
SignalGPT-5.5 ProKimi K2.7-Code
Product typeStandalone API modelCoding-specialized model
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentscustom coding agents, code generation, and tool loops
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window1.05m262k
Cheapest output$180/1M tokens$3.07/1M tokens
Provider routes3 tracked2 tracked
Shared benchmarksGeneBench-Pro leader2 shared

Decision tradeoffs

Choose GPT-5.5 Pro when...
  • GPT-5.5 Pro holds a shared-benchmark lead on GeneBench-Pro, ahead by 18.2 points.
  • GPT-5.5 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • GPT-5.5 Pro has broader tracked provider coverage for fallback and route flexibility.
  • GPT-5.5 Pro uniquely exposes Code execution in local model data.
  • Local decision data tags GPT-5.5 Pro for Coding, RAG, and Agents.
Choose Kimi K2.7-Code when...
  • Kimi K2.7-Code holds a shared-benchmark lead on MCP-Atlas, ahead by 0.7 points.
  • Kimi K2.7-Code has the lower cheapest tracked output price at $3.07/1M tokens.
  • Local decision data tags Kimi K2.7-Code for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Kimi K2.7-Code

GPT-5.5 Pro

$69,000

Cheapest tracked route/tier: OpenAI API <=272K tokens (standard)

Kimi K2.7-Code

$1,257

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $67,743. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

GPT-5.5 Pro -> Kimi K2.7-Code
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Kimi K2.7-Code is $177/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution before moving production traffic.
Kimi K2.7-Code -> GPT-5.5 Pro
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • GPT-5.5 Pro is $177/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • GPT-5.5 Pro adds Code execution in local capability data.

Specs

Specification
Released2026-04-232026-06-12
Context window1.05m262k
Parameters—1T
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedAvailable
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2025-12-

Pricing and availability

Pricing attributeGPT-5.5 ProKimi K2.7-Code
Input price$30/1M tokens$0.61/1M tokens
Output price$180/1M tokens$3.07/1M tokens
Providers
OpenAI APIOpenRouterVercel AI Gateway
Moonshot AI KimiOpenRouter

Capabilities

CapabilityGPT-5.5 ProKimi K2.7-Code
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkGPT-5.5 ProKimi K2.7-Code
GeneBench-Pro20.52.3
MCP-Atlas75.376.0

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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.