July 18, 2026 · 6 min read

15 New AI Models Added: GPT-5.6 Pro, Claude Fast, Grok 4.20 & More

The APIpulse database just got a major update — 15 new models from OpenAI, Anthropic, Google, xAI, and Mistral. We now track 85 models across 10 providers. Here's what's new, what it costs, and when to use each.

OpenAI: GPT-5.6 Pro Variants + Audio Models

OpenAI added Pro variants for the entire GPT-5.6 lineup, plus their first audio-specific API models.

Key insight: The GPT-5.6 Pro variants have the same per-token price as their non-Pro counterparts. The "Pro" designation likely refers to higher rate limits or priority access rather than different model weights. GPT Audio at $2.50/$10 is OpenAI's first dedicated audio API — useful for voice agents and transcription pipelines. o3 Pro at $20/$80 is the most expensive reasoning model available, competing with Claude Opus on complex tasks.

Anthropic: Claude Fast Speed Tiers

Anthropic introduced "Fast" variants for their flagship models — same capabilities, significantly higher throughput, premium pricing.

Key insight: Claude Opus 4.8 Fast at $10/$50 is 2× the standard Opus 4.8 price. Claude Opus 4.7 Fast at $30/$150 is a massive premium — 6× the standard price. These are for latency-sensitive production workloads where response time matters more than cost. If you're building a real-time chat interface or code completion tool, Fast tiers are worth it. For batch processing, stick with standard.

xAI: Grok 4.20 and Grok 4.3

Key insight: Grok 4.20 has a massive 2M token context window — the largest of any model we track. At $1.20/$2.50, it's priced competitively with Claude Sonnet 5 ($2/$10) but with 2× the context. If you're working with extremely long documents, codebases, or multi-turn conversations, Grok 4.20 is the best value for context-heavy work.

Mistral: Large 3 and Small 4

Key insight: Mistral Large 3 at $0.50/$1.50 is 80% cheaper than Claude Sonnet 5 ($2/$10) on input. Mistral Small 4 at $0.15/$0.60 is one of the cheapest capable models available — great for high-volume classification, extraction, and routing tasks. Both support 262K context. For EU-based teams needing GDPR compliance, Mistral remains the best European option.

Google: Nano Banana Image Models

Key insight: Google's "Nano Banana" models are their image generation API, built on Gemini architecture. Nano Banana 2 at $0.50/$3.00 is the cheapest image generation option. Nano Banana Pro at $2/$12 offers higher quality. These compete with DALL-E and Midjourney on the API side.

Quick Comparison: New Models vs Existing Best Options

Which One Should You Use?

The Bigger Picture

These 15 models push the APIpulse database to 85 models across 10 providers. The trends are clear:

• Price deflation continues — Mistral Large 3 at $0.50/$1.50 would've been a flagship-tier price a year ago
• Context windows keep growing — Grok 4.20's 2M context is 10× what GPT-4 offered in 2023
• Specialization is the new frontier — GPT Audio, Nano Banana image models, and o3 Pro reasoning show providers are optimizing for specific use cases, not just general chat
• Speed tiers are a real thing now — Anthropic's Fast variants prove that latency is a product dimension, not just a technical metric

The best strategy in 2026 isn't picking one model — it's using a multi-model approach. Use Mistral Small 4 for high-volume cheap tasks, Grok 4.20 for long-context work, Claude Opus 4.8 Fast for real-time apps, and o3 Pro for complex reasoning. Our decision tree can help you pick.