Engineering Blog

Notes from the build

Engineering insights, architecture deep-dives, and product notes from the Vesprr Software team.

#Anthropic

Zohaib MasoodOct 10, 2026

What is Claude Haiku 5.5? Anthropic's $0.10 small model

Anthropic's small model for high-volume work: classification, extraction, support, subagents. $0.10/$0.50 per 1M tokens, 90% below Haiku 4.5.

AI modelsClaude Haiku 5.5Claude Haiku 5.5 pricing

Sadaf MasoodSep 25, 2026

Claude Opus 5.5 pricing: $4 in, $20 out, and what a job costs

Opus 5.5 costs $4 per million input tokens and $20 per million output, with thinking billed as output. A 10,000-document job runs about $390 a month.

AI modelsClaude Opus 5.5Claude Opus 5.5 pricing

Zohaib MasoodSep 21, 2026

AI agents: what actually stops one reaching a live system

A network allow-list and an automatic halt. Four labs found their agents on real systems after a prompt told them they had no internet access.

Google GeminiAI agent securityIrregular

Zohaib MasoodSep 13, 2026

AI vendor safety clauses: three to sign, two to refuse

Your client wants your AI vendor's safety promises in your contract. Sign report pass-through, capability notice and an incident clock. Refuse a date.

Anthropic embedded evaluatorsDario Amodei pace the frontierAI vendor contract