Frontier AI Models Comparison (September 2026)
Sept 2026 Verified
Intelligence Index #1
58 Pts
Claude Opus 5.5 (Anthropic)
Top Terminal Evals
66.4%
Claude Opus 5.5 (Terminal-Bench 4.0)
Max Output Ceiling
1,000,000
Gemini 4 Argon (Google DeepMind)
Economic Frontier
$0.15 / 1M
DeepSeek V4.1 Flash (Input prompt)
Capability Trade-Off Radar (September 2026)
SWE-bench Pro & Terminal-Bench 4.0 (%)
Model & Lab AA Index SWE-bench Pro Terminal-Bench CursorBench HLE / Math Pricing (Prompt / Out) Context / Output
Claude Opus 5.5 Anthropic (Sept 22, 2026)
58 (#1) 89.9% 66.4% 91.2% 38.4% (31.2% FMath) $4.00 / $20.00 ($0.20 cached) 1M (128k out)
Architecture & Features:

Extended MoE with native multimodal reasoning and recursive multi-layer latent workspace. Adaptive Thinking up to 128k+ deliberation tokens.

Throughput & Latency:

TTFT: ~0.95s (uncached), 0.20s (cached) | Throughput: 60–80 tokens/sec. 40% efficiency boost over Opus 5.

Deployment & Access:

Public API, AWS Bedrock, Google Vertex AI. ASL-4 Responsible Scaling Policy compliance.

GPT-6 Astra OpenAI (Sept 3, 2026)
53 (#2) 85.2% 59.6% 87.5% 34.6% (29.5% FMath) $10.00 / $50.00 ($1.25 cached) 1.05M (128k out)
Architecture & Features:

Causal MoE with integrated multimodal computer-operator harness & native OS-level action tokens. Dynamic MCTS test-time search with self-verification.

Throughput & Latency:

TTFT: ~1.50s | Throughput: 35–55 tokens/sec. High deliberation depth for autonomous software engineering.

Safety & Access Gate:

OpenAI Preparedness Framework 'Critical' classification. Public API Tier 5, ChatGPT Pro, Enterprise.

Gemini 4 Argon Google DeepMind (Sept 30, 2026)
53 (#2) 86.1% 60.1% 88.0% 36.1% (33.0% FMath) $2.00 / $10.00 ($0.20 cached) 1M (1M Out)
Architecture & Features:

Causal Encoder-Decoder MoE co-designed with TPU v6e. Deep tree-search test-time scaling with continuous differentiable latent verification.

Throughput & Latency:

TTFT: ~1.40s | Throughput: 50–75 tokens/sec. 1M-token output capacity for full-repo generation in a single pass.

Access & Cyber Defense:

Gated under Google Fairwind Program for verified critical defense and enterprise partners. Rank #1 Cyber Defense.

Grok 4.7 xAI (Sept 21, 2026)
49 80.4% 54.8% 81.7% 28.7% (22.6% FMath) $2.00 / $6.00 ($0.50 cached) 500k (64k out)
Architecture & Features:

Massive MoE trained on Colossus cluster with integrated real-time search & code execution layers. Configurable reasoning effort.

Throughput & Latency:

TTFT: ~0.85s | Throughput: 70–95 tokens/sec. Aggressive price-to-performance ratio for software engineering.

Deployment & Access:

Public API, xAI Cloud, SuperGrok.

Gemini 3.8 Flash Google DeepMind (Sept 10, 2026)
46 77.2% 51.4% 79.1% 25.2% (19.4% FMath) $0.75 / $3.75 ($0.075 cached) 1.05M (65k out)
Architecture & Features:

Linear-attention / Sparse MoE hybrid optimized for extreme batching throughput and sub-agent dispatching.

Throughput & Latency:

TTFT: ~0.22s | Throughput: 200–260 tokens/sec. Industry speed leader.

Specialized Cyber Variant:

Gemini 3.8 Flash Cyber variant leads AutoPatchBench and CyberSOCEval for real-time triage.

DeepSeek V4.1 Flash DeepSeek (Sept 10, 2026)
45 (Pareto) 75.8% 49.6% 77.4% 24.0% (17.5% FMath) $0.15 / $0.60 ($0.03 cached) 1M (64k out)
Architecture & Features:

Compressed attention MoE with dynamic expert pruning during inference. Ultra-low KV cache footprint.

Throughput & Latency:

TTFT: ~0.28s | Throughput: 180–240 tokens/sec. 30x cheaper than closed flagships.

Deployment:

Public API / Open Ecosystem (vLLM, Ollama, Together, Fireworks).

Meta Muse Spark 1.3 Meta AI (Sept 2, 2026)
44 73.6% 48.2% 75.8% 22.8% (16.0% FMath) $1.25 / $4.25 ($0.15 cached) 1.05M (65k out)
Architecture & Features:

Multimodal reasoning MoE optimized for messy multi-agent orchestration and dynamic tool routing with Llama Guard 5.

Throughput & Latency:

TTFT: ~0.38s | Throughput: 120–160 tokens/sec.

Deployment:

Public API, Llama Stack Partners, Open Weights.

Architectural & Strategic Trends (September 2026)

The Terminal-Bench & Agentic Pivot

Static benchmark saturation has pushed evaluation toward live terminal execution harnesses (Terminal-Bench 4.0) and multi-file IDE refactoring (CursorBench 4.0). Claude Opus 5.5 leads with 66.4% on Terminal-Bench and 89.9% on SWE-bench Pro.

The Cyber-Defense Frontier

Models like Gemini 4 Argon (Google Fairwind Program) and GPT-6 Astra (Preparedness 'Critical') are co-engineered for autonomous vulnerability discovery and instant zero-day patch synthesis, operating under strict cryptographic gating.

Output Horizon Expansion

Gemini 4 Argon's 1M-token output limit allows whole-repository synthesis in a single generation, while DeepSeek V4.1 Flash delivers extreme efficiency ($0.15 / 1M tokens) for continuous agent memory loops.