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Claude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA) vs OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA): $3.00 vs $2.00 / 1M Tokens

Switching a 100M input / 20M output monthly workload from Claude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA) to OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) saves $240.00/month ($2880.00/year, -33%) 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 • Anthropic

Claude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA)

Standard Input / Output:$3.00 / $15.00
Warm Cache Read / Write:$0.3 / $3.75
Batch API (50% Off):$1.5 / $7.5
Context Window & Cliff:200,000 tokens
P90 TTFT / Throughput:580ms / 78 tok/s
Open Claude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA) 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)Claude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA)OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)Architectural Mechanism
Mode A: Direct Raw Tool Output (700 KB)$585.00$382.0047 × Read() dumped into context; hits 200K cliff
Mode B: Context-Mode Sandbox Only (3.6 KB)$112.50$60.00SQLite FTS5 & ctx_execute (98% byte drop, unpinned cache)
Mode C: Context-Mode + Etuki 4-Block Cache Lock$51.00 (-91%)$33.50 (-91%)98% tool stdout folding + 90% warm 0.1x prefix cache hit

Monthly Enterprise Workload TCO: Claude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA) vs OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)

Workload ScenarioClaude Opus 5.5 (Mapped to Anthropic Claude 3.7 Sonnet GA) (Cached)OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) (Cached)Recommended Routing Winner
① Coding Agent (15M In / 3M Out)$57.60/mo$36.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)
② Enterprise RAG (100M In / 15M Out)$309.00/mo$200.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)
③ Long-Doc SEC Analysis (250M In / 30M Out)$660.00/mo$440.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)
④ Async Batch Pipeline (500M In / 80M Out)$1350.00/mo$820.00/moOpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) (50% Batch Discount)