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Eetuki
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Kimi K2.5 vs OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA): $2.13 vs $2.00 / 1M Tokens

Switching a 100M input / 20M output monthly workload from Kimi K2.5 to OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) saves $23.40/month ($280.80/year, -14%) on baseline token rates. For streaming responsiveness, OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) leads with a 410ms P90 TTFT (98 tok/s).

Contender A • KIMI

Kimi K2.5

Standard Input / Output:$2.13 / $8.52
Warm Cache Read / Write:$0.213 / $2.662
Batch API (50% Off):$1.065 / $4.26
Context Window & Cliff:200,000 tokens
P90 TTFT / Throughput:673ms / 94 tok/s
Open Kimi K2.5 6-Module Audit →
Contender B • OpenAI

OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)

Standard Input / Output:$2.00 / $8.00
Warm Cache Read / Write:$0.5 / $2
Batch API (50% Off):$1 / $4
Context Window & Cliff:1,000,000 tokens
P90 TTFT / Throughput:410ms / 98 tok/s
Open OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) 6-Module Audit →
⚡ CONTEXT-MODE SANDBOX (315KB → 5.4KB) × ETUKI CACHE PINNING BENCHMARKOpen Full Context-Mode Calculator →

Coding Agent TCO (100 Sessions): Raw Tool Output (700KB) vs. Context-Mode + Etuki Prefix Cache

Execution Mode (100 Agent Sessions)Kimi K2.5OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)Architectural Mechanism
Mode A: Direct Raw Tool Output (700 KB)$406.83$382.0047 × Read() dumped into context; hits 200K cliff
Mode B: Context-Mode Sandbox Only (3.6 KB)$73.48$60.00SQLite FTS5 & ctx_execute (98% byte drop, unpinned cache)
Mode C: Context-Mode + Etuki 4-Block Cache Lock$30.88 (-92%)$33.50 (-91%)98% tool stdout folding + 90% warm 0.1x prefix cache hit

Monthly Enterprise Workload TCO: Kimi K2.5 vs OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)

Workload ScenarioKimi K2.5 (Cached)OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) (Cached)Recommended Routing Winner
① Coding Agent (15M In / 3M Out)$34.51/mo$36.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)
② Enterprise RAG (100M In / 15M Out)$187.44/mo$200.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)
③ Long-Doc SEC Analysis (250M In / 30M Out)$404.70/mo$440.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)
④ Async Batch Pipeline (500M In / 80M Out)$873.30/mo$820.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) (50% Batch Discount)