OpenAI: GPT-5.1 vs Anthropic: Claude Opus 5.5: Live Promos, Pricing, Hidden Fees & Latency
Verified 2026 FinOps benchmark comparing OpenAI: GPT-5.1 (openai/gpt-5.1) vs Anthropic: Claude Opus 5.5 (anthropic/claude-opus-5.5). Simulate cache read multipliers, context cliffs, MAU bills, and P90 latency.
OpenAI: GPT-5.1 (openai/gpt-5.1) 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).
Anthropic: Claude Opus 5.5 (anthropic/claude-opus-5.5) — $25,000 Startup Credits & 50% Cache Promo
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).
In Etuki October 2026 FinOps telemetry comparing OpenAI: GPT-5.1 (API ID: openai/gpt-5.1) vs Anthropic: Claude Opus 5.5 (API ID: anthropic/claude-opus-5.5), OpenAI: GPT-5.1 offers lower standard input pricing at $1.25/1M tokens ($10/1M output), while OpenAI: GPT-5.1 leads in cached prefix economics at $0.625/1M tokens (50% discount). OpenAI: GPT-5.1 achieves a 0ms faster P90 time-to-first-token latency (280ms vs 280ms).
Auto-discovered via live global telemetry registry.
Auto-discovered via live global telemetry registry.
| Specification / FinOps Dimension | OpenAI: GPT-5.1 | Anthropic: Claude Opus 5.5 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | openai/gpt-5.1 | anthropic/claude-opus-5.5 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $1.25 / $10 | $4 / $20 | OpenAI: GPT-5.1 |
| Cache Read Price (per 1M) | $0.625/1M (50% Off) | $2/1M (50% Off) | OpenAI: GPT-5.1 |
| Context Window / Max Output | 391K In / 125K Out | 977K In / 125K Out | OpenAI: GPT-5.1 |
| P90 First-Token / Edge Latency | 280ms | 280ms | OpenAI: GPT-5.1 (-0ms) |
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step chan
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 OpenAI: GPT-5.1 to Anthropic: Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step chan Verified P90 latency of 280ms.