What is the best LLM for coding in 2026?

Claude 4 Opus leads with 96.2% on HumanEval, followed by Claude 3.5 Sonnet (92.0%), and GPT-5 (94.1%). For cost-effective coding, DeepSeek V3 offers 89.6% HumanEval at just $0.27/1M tokens input. Open-source Llama 4 405B achieves 89.8% for self-hosting.

Which LLM has the largest context window?

Gemini 3 Ultra leads with 2 million tokens, followed by Gemini 2.0 Flash (1M), Claude 4 Opus (500K), GPT-5 (256K), and Claude 3.5 Sonnet/o1 Pro (200K). Most other models support 128K tokens.

What is the cheapest LLM API in 2026?

Gemini 2.0 Flash is cheapest at $0.10/1M input tokens. DeepSeek V3 offers exceptional value at $0.27/1M with GPT-4 level performance. For self-hosting, Llama 4 and DeepSeek V3 open weights eliminate API costs entirely.

What is the best open source LLM in 2026?

DeepSeek V3 leads open-source with 89.6% HumanEval and 87.5% MMLU at 671B MoE parameters. Llama 4 405B offers the most parameters (405B) with strong performance. Qwen 2.5 72B provides Apache 2.0 licensing. Phi-4 (14B) offers the best small model performance.

Which LLM is best for reasoning and math?

OpenAI o1 Pro dominates reasoning with 99.1% on GSM8K and 96.4% on MATH benchmarks. It uses chain-of-thought to solve PhD-level problems. For cost-effective reasoning, DeepSeek V3 achieves 94.8% GSM8K at 1/50th the cost.

Which LLM is best for enterprise use?

Claude 4 Opus offers the best safety (99/100) and 500K context for enterprise. GPT-5 provides robust API ecosystem. For European/GDPR compliance, Mistral Large 3 is ideal. Gemini 3 Ultra integrates with Google Workspace.

GPT-4o vs Claude 3.5 Sonnet: Which is better?

Claude 3.5 Sonnet excels at coding (92.0% vs 90.2% HumanEval) and complex instructions. GPT-4o leads in multimodal and voice capabilities (96 vs 89). Claude 3.5 has larger context (200K vs 128K). Pricing is similar.

Is DeepSeek V3 as good as GPT-4?

DeepSeek V3 closely rivals GPT-4 on benchmarks: 87.5% MMLU (vs 88.7%), 89.6% HumanEval (vs 90.2%), 94.8% GSM8K (vs 95.8%). At $0.27/1M tokens vs $2.50/1M, it offers similar performance at 1/10th the cost.

LLM Comparison 2026

Compare 13+ proprietary and 8+ open-source LLMs with detailed benchmarks, pricing, and use cases

13+

Models

Benchmarks

$0.10-$20

Input Pricing

Max Context

GPT-5.4

OpenAI

256K

Latest frontier with best reasoning

Pricing

$20 / $80 per 1M

Benchmarks

MMLU: 94.2% | HumanEval: 94.8% | GSM8K: 99.5%

Strengths

State-of-the-art reasoning
Best math/logic
Superior code gen
Contextual understanding

Claude 4.6 Opus

Anthropic

500K

Best safety & enterprise reliability

Pricing

$18 / $90 per 1M

Benchmarks

MMLU: 93.8% | HumanEval: 93.6% | GSM8K: 98.8%

Strengths

Best safety (99/100)
Extended thinking
Large context (500K)
Production-ready

GPT-5.2

OpenAI

256K

Balanced variant with strong performance

Pricing

$4 / $12 per 1M

Benchmarks

MMLU: 92.1% | HumanEval: 93.5% | GSM8K: 97.4%

Strengths

Great value
Balanced performance
Production use
Fast response times

DeepSeek V3

DeepSeek

128K

Open-source powerhouse rivaling GPT-4

Pricing

$0.27 / $1.10 per 1M

Benchmarks

MMLU: 87.5% | HumanEval: 89.6% | GSM8K: 94.8%

Strengths

1/10th GPT cost
MoE efficiency
Strong coding
MIT license

Gemini 3 Ultra

Google

Largest context with 2M tokens

Pricing

$2 / $10 per 1M

Benchmarks

MMLU: 91.2% | HumanEval: 92.1% | GSM8K: 96.8%

Strengths

2M context window
Long documents
Multimodal
Google integration

Llama 4 405B (Open Source)

Top Open Source LLMs

DeepSeek V3

671B MoE (37B active) | MIT License

Rivals GPT-4 performance at 1/10th the cost. 89.6% HumanEval, 87.5% MMLU.

View on HuggingFace

Llama 4 405B

405B Parameters | Llama License

Meta's flagship with 89.8% HumanEval. Best for fine-tuning and customization.

View on HuggingFace

Why Choose Open Source LLMs?

Cost Control

Self-host to eliminate per-token costs. At scale, 10-100x cheaper than API calls.

Data Privacy

Keep sensitive data on your infrastructure. No third-party data retention.

Customization

Fine-tune on your domain data. Modify behavior and add specialized knowledge.

LLM Comparison 2026

Top Open Source LLMs

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