LLM Reference

Composer 2.5 vs DeepSeek V4 Flash

Composer 2.5 (2026) and DeepSeek V4 Flash (2026) compare an IDE-native agent built on Kimi K2.5 against a standalone API model. Composer 2.5 ships a 1m-token context window, while DeepSeek V4 Flash ships a 1m-token context window. On Terminal-Bench 2.0, Composer 2.5 leads by 12.4 pts. This page treats the result as workflow and deployment fit, not a universal model winner.

Use Composer 2.5 when you want the packaged IDE-native agent built on Kimi K2.5 workflow; use DeepSeek V4 Flash when you need a model you can route, wrap, or run outside that product surface.

Decision scorecard

Local evidence first
SignalComposer 2.5DeepSeek V4 Flash
Product typeIDE-native agent built on Kimi K2.5Standalone API model
Best forLong Cursor IDE sessions and autonomous in-IDE codingAPI builders, non-IDE automation, and long-context analysis
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window1m1m
Cheapest output$2.50/1M tokens$0.12/1M tokens
Provider routes1 tracked5 tracked
Shared benchmarksTerminal-Bench 2.0 leader2 shared

Decision tradeoffs

Choose Composer 2.5 when...
  • Composer 2.5 holds a shared-benchmark lead on Terminal-Bench 2.0, ahead by 12.4 points.
  • Composer 2.5 uniquely exposes Code execution, IDE integration, and Parallel agents in local model data.
  • Local decision data tags Composer 2.5 for Coding, RAG, and Agents.
Choose DeepSeek V4 Flash when...
  • DeepSeek V4 Flash has the lower cheapest tracked output price at $0.12/1M tokens.
  • DeepSeek V4 Flash has broader tracked provider coverage for fallback and route flexibility.
  • DeepSeek V4 Flash uniquely exposes Reasoning and Structured outputs in local model data.
  • Local decision data tags DeepSeek V4 Flash 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 DeepSeek V4 Flash

Composer 2.5

$1,025

Cheapest tracked route/tier: Cursor Standard async

DeepSeek V4 Flash

$76.26

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $949. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Composer 2.5 -> DeepSeek V4 Flash
  • No overlapping tracked provider route is sourced for Composer 2.5 and DeepSeek V4 Flash; plan for SDK, billing, or endpoint changes.
  • DeepSeek V4 Flash is $2.38/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Code execution, IDE integration, and Parallel agents before moving production traffic.
  • DeepSeek V4 Flash adds Reasoning and Structured outputs in local capability data.
DeepSeek V4 Flash -> Composer 2.5
  • No overlapping tracked provider route is sourced for DeepSeek V4 Flash and Composer 2.5; plan for SDK, billing, or endpoint changes.
  • Composer 2.5 is $2.38/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Check replacement coverage for Reasoning and Structured outputs before moving production traffic.
  • Composer 2.5 adds Code execution, IDE integration, and Parallel agents in local capability data.

Specs

Specification
Released2026-05-182026-04-24
Context window1m1m
Parameters—284B
Architecture-Mixture of Experts
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedAvailable
CodeNot releasedUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff--

Pricing and availability

Pricing attributeComposer 2.5DeepSeek V4 Flash
Input price
Standard async
$0.50/1M tokens
Cursor Composer 2.5 standard tier.
Fast interactive
$3/1M tokens
Cursor says fast has the same intelligence and is the default.
Off-peak
$0.22/1M tokens
All UTC hours outside DeepSeek's peak windows. Cache-hit input: $0.007 per 1M tokens; cache-miss input: $0.22 per 1M; output: $0.66 per 1M.
Peak
$0.44/1M tokens
01:00-04:00 and 06:00-10:00 UTC. Cache-hit input: $0.014 per 1M tokens; cache-miss input: $0.44 per 1M; output: $1.32 per 1M.
Output price
Standard async
$2.50/1M tokens
Cursor Composer 2.5 standard tier.
Fast interactive
$15/1M tokens
Cursor says fast has the same intelligence and is the default.
Off-peak
$0.66/1M tokens
All UTC hours outside DeepSeek's peak windows. Cache-hit input: $0.007 per 1M tokens; cache-miss input: $0.22 per 1M; output: $0.66 per 1M.
Peak
$1.32/1M tokens
01:00-04:00 and 06:00-10:00 UTC. Cache-hit input: $0.014 per 1M tokens; cache-miss input: $0.44 per 1M; output: $1.32 per 1M.
Providers
Cursor
DeepSeek PlatformOpenRouterMicrosoft FoundryVercel AI GatewayNovita AI

Capabilities

CapabilityComposer 2.5DeepSeek V4 Flash
VisionNoNo
MultimodalNoNo
ReasoningNoYes
JSON / Tool useYesYes
Structured outputsNoYes
Code executionYesNo
IDE integrationYesNo
Computer useNoNo
Parallel agentsYesNo

Benchmarks

BenchmarkComposer 2.5DeepSeek V4 Flash
Terminal-Bench 2.069.356.9
SWE-bench Multilingual79.873.3

Harness caveat. Composer 2.5 is measured as IDE-native agent built on Kimi K2.5, while DeepSeek V4 Flash is standalone API model. Treat shared benchmark scores as directional because IDE or product scaffolding, tool access, prompt routing, and interaction mode can change real application results.

Continue comparing

Model pages
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Last reviewed: 2026-07-03. Data sourced from public model cards and provider documentation.