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 current production LLMs with real pricing, context windows, and use cases. Data current as of April 2026.

Models

Verified

April 2026

$0.075-$15

Input Pricing

Max Context

GPT-4o

OpenAI

Current frontier model

Context Window:

128K

Pricing:

$15 / $60 per 1M (input/output)

Strengths:

Advanced reasoning

Multimodal

Strong coding

Production-ready

Claude 3.5 Sonnet

Anthropic

Best balance of capability and speed

Context Window:

200K

Pricing:

$3 / $15 per 1M

Strengths:

Great coding

Extended context

Production stable

Strong safety

Gemini 2 Flash

Google

Efficient with large context

Context Window:

Pricing:

$0.075 / $0.3 per 1M

Strengths:

Large context

Fast inference

Multimodal

Cost effective

DeepSeek-R1

DeepSeek

Open-source with strong reasoning

Context Window:

64K

Pricing:

Open source (self-host)

Strengths:

Open weights

Reasoning focused

Cost effective

Customizable

Llama 3.1 405B

Mistral Large

Mistral

Efficient proprietary model

Context Window:

32K

Pricing:

$2.7 / $8.1 per 1M

Strengths:

Fast inference

Good value

Multilingual

Production ready

Model Selection Guide

Best for Coding

Recommended:

Claude 3.5 Sonnet

GPT-4o

Strong code generation and understanding for software engineering tasks

Best for Long Documents

Recommended:

Gemini 2 Flash

Claude 3.5 Sonnet

Gemini: 1M tokens | Claude: 200K - excellent for analyzing large documents

Best for Cost

Recommended:

Gemini 2 Flash

Mistral Large

DeepSeek-R1

Gemini: $0.075/1M input | DeepSeek/Llama: Free open-source options

Best for Enterprise

Recommended:

Claude 3.5 Sonnet

GPT-4o

Proven stability and safety for production applications

Best for Self-Hosting

Recommended:

Llama 3.1 405B

DeepSeek-R1

Full control, no per-token costs, customizable for your use case

Best Multimodal

Recommended:

GPT-4o

Gemini 2 Flash

Claude 3.5 Sonnet

Image, video, and text understanding across all options

Note: Pricing and capabilities shown are accurate as of April 2026. LLM capabilities evolve rapidly. For the latest benchmarks and pricing, check the official documentation from each provider.

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LLM Comparison 2026

GPT-4o

Claude 3.5 Sonnet

Gemini 2 Flash

DeepSeek-R1

Llama 3.1 405B

Mistral Large

Model Selection Guide

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