Anthropic Claude Sonnet 5.5 vs xAI Grok 4.7: Live Promos, Pricing, Hidden Fees & Latency
Sonnet 5.5 High-Velocity Coding Promo: $0.10/1M Cached Input & $1/$5 Batch Tier
Anthropic's September/October 2026 rollout prices Claude Sonnet 5.5 at half of Opus 5.5 ($2/$10) while activating $0.10/1M (0.05x) cached input reads and $1.00/$5.00 asynchronous batch processing.
xAI Grok 4.7 (grok-4.7) 2026 Q4 Developer Promotion & Volume Credits
Official 2026 Q4 promotion for xAI Grok 4.7: Activate ephemeral prefix caching to slash input costs by 75% (down to 0.5/1M) or route via asynchronous Batch API for 50% off standard token rates.
In Etuki October 2026 FinOps telemetry comparing Anthropic Claude Sonnet 5.5 (API ID: claude-sonnet-5-5) vs xAI Grok 4.7 (API ID: grok-4.7), Anthropic Claude Sonnet 5.5 offers lower standard input pricing at $2/1M tokens ($10/1M output), while Anthropic Claude Sonnet 5.5 leads in cached prefix economics at $0.1/1M tokens (95% discount). xAI Grok 4.7 achieves a 10ms faster P90 time-to-first-token latency (130ms vs 140ms).
Extended thinking tokens bill at Sonnet 5.5 standard $10/1M output rate; cache read cut 50% to $0.10/1M on Oct 7.
<200K: $2.00/$6.00 ($0.50 cache); >=200K (including cached tokens) full-request 2x cliff: $4.00/$12.00 ($1.00 cache). Not eligible for Batch discount (0%); Priority 2x; US endpoint +10%.
| Specification / FinOps Dimension | Anthropic Claude Sonnet 5.5 | xAI Grok 4.7 | Verified Advantage |
|---|---|---|---|
| Official Vendor API ID | claude-sonnet-5-5 | grok-4.7 | Pinned Snapshot IDs |
| Standard Input / Output (per 1M) | $2 / $10 | $2 / $6 | Anthropic Claude Sonnet 5.5 |
| Cache Read Price (per 1M) | $0.1/1M (95% Off) | $0.5/1M (75% Off) | Anthropic Claude Sonnet 5.5 |
| Context Window / Max Output | 1000K In / 128K Out | 500K In / 128K Out | Anthropic Claude Sonnet 5.5 |
| P90 First-Token / Edge Latency | 140ms | 130ms | xAI Grok 4.7 (-10ms) |
Anthropic Sep 28, 2026 production coding workhorse ($2/$10 per 1M). Official cache read cut 50% from $0.20 to $0.10/1M effective Oct 7, 2026.
xAI frontier reasoning & coding model (500K context): <200K at $2/$6 ($0.50 cache); >=200K at $4/$12 ($1.00 cache). No batch discount.
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 Sonnet 5.5 to xAI Grok 4.7
xAI frontier reasoning & coding model (500K context): <200K at $2/$6 ($0.50 cache); >=200K at $4/$12 ($1.00 cache). No batch discount. Verified P90 latency of 130ms.