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 — UPDATED JULY 27
● Cheaper: Muse Spark — $1.25/$4.25/M vs Opus 5 $5/$25/M (75% cheaper input)
● Better writing: Claude Opus 5
● Better parallel agents: Muse Spark — parallel sub-agent delegation built in
● Better effort control: Claude Opus 5 — 5-level toggle
● Better safety (FLI): Claude Opus 5 — Anthropic C+ vs Meta D+
● Global access: Opus 5 — Muse Spark API US-only
● Auto-fallback: Opus 5 only — replaces hard refusals
Claude Opus 5 for: Writing quality, global availability (non-US), regulated industries (FLI C+ vs D+, White House framework), auto-fallback for production pipelines, and effort-level control across tasks.
Muse Spark 1.1 for: US-based teams who want the cheapest agentic API (75% cheaper), parallel sub-agent workflows, Computer Use, and are comfortable with Meta's D+ FLI safety rating. SDK drop-in makes the test cheap.
Last updated July 27, 2026. Related: Muse Spark 1.1 full review → · Claude Opus 5 full review →