AI Models · Paid vs Paid

SAFugu Ultra Paid vs INMercury 2.5 Paid

Fugu Ultra vs Mercury 2.5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Fugu Ultra — full profile ›  ·  Mercury 2.5 — full profile ›

Prices & specs refreshed from live data · olud.ai

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

SAFugu UltraPaidSakana AI
$5 /M input
$30 /M outputManaged API (no infra to run)
TypeProprietary
Context window1M tokens
MultimodalYes
Self-hostNo
INMercury 2.5PaidInception
$0.04 /M input
$0.15 /M outputManaged API (no infra to run)
TypeProprietary
Context window260K tokens
MultimodalNo
Self-hostNo
Choose Mercury 2.5 for the lower output price ($0.15/M vs $30/M). Choose Fugu Ultra if you need the larger 1M context window.

Fugu Ultra vs Mercury 2.5 specs

SpecFugu UltraMercury 2.5Winner
MakerSakana AIInception–
TypeProprietaryProprietary–
Context window1M tokens260K tokensSAFugu Ultra
Input price$5/M$0.04/MINMercury 2.5
Output price$30/M$0.15/MINMercury 2.5
Vision / multimodalYesNoSAFugu Ultra
Tool / function callingYesYes= Tie
Self-hostableNo (API only)No (API only)–
LicenseProprietaryProprietary–

Price gap & when to choose each

200×cheaper per output token

Mercury 2.5 is ~200× cheaper than Fugu Ultra on output tokens ($0.15 vs $30 per M tokens).

SAChoose Fugu Ultra if…
  • You want frontier performance through a managed API
  • You need the longer 1M context window
  • You value reliability & ecosystem
  • You don't want to manage infrastructure
INChoose Mercury 2.5 if…
  • You want frontier performance through a managed API
  • You want the lower output price
  • You value reliability & ecosystem
  • You don't want to manage infrastructure

Feature comparison

CapabilityFugu UltraMercury 2.5
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✗
Tool / function calling✓✓
1M+ context window✓✗

How Fugu Ultra and Mercury 2.5 score

🤝 Neck and neck on these criteria (3.1 vs 3.0 / 5).
CriterionFugu UltraMercury 2.5
Cost-efficiency3.05.0
Context window5.04.0
Openness1.51.5
Self-hosting1.01.0
Multimodality5.03.5

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

Fugu Ultra Paid

Sakana AI · Proprietary

Fugu Ultra is the higher-performance model in Sakana AI's Fugu family. Rather than a single monolithic model, Fugu is a learned multi-agent orchestration system: a language model trained to route...

Mercury 2.5 Paid

Inception · Proprietary

Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception. Instead of generating tokens sequentially, Mercury 2.5 produces and refines multiple tokens in parallel, achieving...

Frequently asked questions

Fugu Ultra vs Mercury 2.5 — which is cheaper?

Mercury 2.5 is cheaper on output ($0.15/M vs $30/M).

Which has the larger context window?

Fugu Ultra offers the larger context window (1M tokens).

Fugu Ultra vs Mercury 2.5 — which should I pick in 2026?

Choose Mercury 2.5 for the lower output price ($0.15/M vs $30/M). Choose Fugu Ultra if you need the larger 1M context window.

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