Anthropic Claude Opus 5.5 vs OpenAI GPT-5.6 Terra: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing Anthropic Claude Opus 5.5 (claude-opus-5-5) vs OpenAI GPT-5.6 Terra (gpt-5.6-terra). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
Claude for Startups Program ($25,000 API Credits) & 95% Off Ephemeral Cache Reads
Anthropic's Q4 2026 developer promotion combines $25,000 in Claude API credits for early-stage builders with a permanent 20% base price reduction on Opus 5.5 ($4/$20), 0.05x ($0.20/1M) prompt cache reads, and 50% off Batch API processing ($2/$10 with 300K max output).
OpenAI GPT-5.6 Terra (gpt-5.6-terra) Startup Credits & Batch API 50% Off Promo
OpenAI GPT-6.1 Sol ($2/$10 base rate) qualifies for immediate 75% automatic prefix caching ($0.50/1M), 50% off 24-hour Batch API completions ($1/$5), and up to $150,000 in OpenAI/Azure Foundry credits via Microsoft for Startups Founders Hub (no VC funding required for initial tiers).
In Etuki October 2026 FinOps telemetry comparing Anthropic Claude Opus 5.5 (API ID: claude-opus-5-5) vs OpenAI GPT-5.6 Terra (API ID: gpt-5.6-terra), OpenAI GPT-5.6 Terra offers lower standard input pricing at $2/1M tokens ($12/1M output), while Anthropic Claude Opus 5.5 leads in cached prefix economics at $0.2/1M tokens (95% discount). OpenAI GPT-5.6 Terra achieves a 60ms faster P90 time-to-first-token latency (290ms vs 350ms).
Adaptive thinking is always on; high effort generates ~119K thinking tokens/task. Fast mode costs $8/$40; inference_geo:"us" adds +10%.
Enable Prompt Context Caching & Batch API to reduce repeated system prompt input token burn by 50%-97.5%.
| Specification / FinOps Dimension | Anthropic Claude Opus 5.5 | OpenAI GPT-5.6 Terra | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | claude-opus-5-5 | gpt-5.6-terra | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $4 / $20 | $2 / $12 | OpenAI GPT-5.6 Terra |
| Cache Read Price (per 1M) | $0.2/1M (95% Off) | $1/1M (50% Off) | Anthropic Claude Opus 5.5 |
| Context Window / Max Output | 1000K In / 128K Out | 400K In / 128K Out | Anthropic Claude Opus 5.5 |
| P90 First-Token / Edge Latency | 350ms | 290ms | OpenAI GPT-5.6 Terra (-60ms) |
Ranked #1 on Artificial Analysis Intelligence Index (Score 58). Cuts Opus 5 pricing by 20% and features 0.05x ($0.20/1M) cache reads.
Balanced enterprise general-purpose model in the GPT-5.6 family with 1M context window.
Real-Time Stack Cost & Hidden-Fee Simulator (MAU / Token / Egress / GMV)
Calibrated with Reddit r/FinOps & r/devops telemetry: Includes Context Caching, Bandwidth Egress, and MoR Tax
🌍Switch from Anthropic Claude Opus 5.5 to OpenAI GPT-5.6 Terra
Balanced enterprise general-purpose model in the GPT-5.6 family with 1M context window. Verified P90 latency of 290ms.