Tier 2 produced this analysis during phase2_4_5_call_site_completion_20260621
Phase 6e. Supersedes Tier 1's draft at PHASE3_HYPOTHETICAL_PROMOTION.md (kept
as the hypothesis doc; this is the refined version with in-context data
from Phase 6b/6d work in src/ai_client.py).
Key findings:
- Measured 104 history references (Tier 1 estimated 112; 7% under)
- Anthropic dominates per-turn cost (~35-65µs vs Tier 1's 8-15µs estimate)
- Grok/qwen/llama are LOWER than Tier 1 estimated (~400ns vs 2-8µs)
- Total per-session: ~0.5-1.0ms (Tier 1 estimated 1.1-2.4ms)
- Discovered 3 hidden cross-references Tier 1 missed (_strip_private_keys,
_extract_minimax_reasoning, _send_llama_native)
- Recommendations for the future Phase 3 track: anthropic first; use
'with h.lock: msg_list = h.messages' for read snapshots; use
'with h.lock: h.messages = [filtered]' for in-place mutations
Covers all 6 senders (anthropic, deepseek, minimax, grok, qwen, llama)
with per-site cost estimates + hidden cross-references + recommendations.
The audit (code_path_audit_20260607) quantifies these estimates after merge.
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