MODEL VERSIONS ON THIS PAGE HAVE MOVED — CHECKED 8 OCTOBER 2026
Current line, with published API pricing per million tokens:
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OpenAI — GPT-6 Sol (paid ChatGPT), GPT-6 Luna ($0.10 / $0.50), GPT-6.1 Sol ($2.00 / $10.00), GPT-6 Astra
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Anthropic — Claude Opus 5.5, Sonnet 5.5 ($2.00 / $10.00), Haiku 5.5 ($0.10 / $0.50 below 100K), Fable 5.1
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xAI — Grok 4.3 ($1.25 / $2.50), Grok 4.7 ($2.00 / $6.00)
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Google — Gemini 3.5 Flash-Lite ($0.30 / $2.50), Gemini 3.8 Flash ($0.75 / $3.75 to 31 Dec), Gemini 4 Argon
The comparison below is kept because the reasoning still holds — how these tiers trade price against capability has not changed. The version numbers and prices have.
Current pricing table →
QUICK VERDICT — AUGUST 2026
● AA STS Quality Index: Grok TF 2.0 — 82.9% vs Gemini 3.1 Flash Live — 69.5%
● Quality gap: 13.4 percentage points — significant
● Multimodal: Gemini Flash Live — sees video/screen in real time. Grok TF 2.0 — audio only.
● Google integration: Gemini Flash Live — native Google Workspace, Meet, Search. Grok — none.
● Pricing: Grok — $0.08/min flat. Gemini — per token (complex, varies by modality)
● Noisy environments: Grok TF 2.0 — 10× better than leading transcription models
Grok Voice TF 2.0 for: Pure voice agent quality — the 13.4-point AA STS advantage is substantial. Noisy environment call centres, customer support bots, sales voice agents. Simple per-minute pricing. Does not see video or screen.
Gemini 3.1 Flash Live for: Use cases where the model needs to see what the user sees (screen sharing, video calls, product demo assistance). Native Google Workspace integration. Despite the lower STS benchmark, the multimodal capability is a genuine differentiator for visually-assisted voice applications.
Last updated August 4, 2026. Related: Grok Voice TF 2.0 launch review →