How much does GPT 5.3 Codex cost compared to OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) per 1M tokens?

GPT 5.3 Codex bills $1.29/1M input and $4.52/1M output ($0.129/1M cached read), whereas OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) bills $2.00/1M input and $8.00/1M output ($0.5/1M cached read). Choosing GPT 5.3 Codex saves 36% ($140.60/month per 100M input + 20M output tokens).

How do GPT 5.3 Codex and OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) perform with Context-Mode sandbox compression in Claude Code or Cursor?

Combining Context-Mode 98% tool-output folding (700KB -> 3.6KB) with Etuki 4-block prefix cache pinning reduces 100-session coding agent spend on GPT 5.3 Codex from $243.83 to $17.1 (-93%), and on OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) from $382 to $33.5 (-91%).

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GPT 5.3 Codex vs OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA): $1.29 vs $2.00 / 1M Tokens

Switching a 100M input / 20M output monthly workload from OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) to GPT 5.3 Codex saves $140.60/month ($1687.20/year, -36%) on baseline token rates. For streaming responsiveness, GPT 5.3 Codex leads with a 327ms P90 TTFT (94 tok/s).

Contender A • GPT

GPT 5.3 Codex

Standard Input / Output:$1.29 / $4.52

Warm Cache Read / Write:$0.129 / $1.613

Batch API (50% Off):$0.645 / $2.26

Context Window & Cliff:200,000 tokens

P90 TTFT / Throughput:327ms / 94 tok/s

Open GPT 5.3 Codex 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)	GPT 5.3 Codex	OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)	Architectural Mechanism
Mode A: Direct Raw Tool Output (700 KB)	$243.83	$382.00	47 × Read() dumped into context; hits 200K cliff
Mode B: Context-Mode Sandbox Only (3.6 KB)	$42.59	$60.00	SQLite FTS5 & ctx_execute (98% byte drop, unpinned cache)
Mode C: Context-Mode + Etuki 4-Block Cache Lock	$17.10 (-93%)	$33.50 (-91%)	98% tool stdout folding + 90% warm 0.1x prefix cache hit

Monthly Enterprise Workload TCO: GPT 5.3 Codex vs OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA)

Workload Scenario	GPT 5.3 Codex (Cached)	OpenAI GPT 6.1 Terra (Mapped to OpenAI GPT-4.1 GA) (Cached)	Recommended Routing Winner
① Coding Agent (15M In / 3M Out)	$18.98/mo	$36.00/mo	GPT 5.3 Codex
② Enterprise RAG (100M In / 15M Out)	$103.92/mo	$200.00/mo	GPT 5.3 Codex
③ Long-Doc SEC Analysis (250M In / 30M Out)	$225.90/mo	$440.00/mo	GPT 5.3 Codex
④ Async Batch Pipeline (500M In / 80M Out)	$503.30/mo	$820.00/mo	GPT 5.3 Codex (50% Batch Discount)