Head-to-Head Model Comparison

o3-pro vs Grok 4.20 (Reasoning)

Benchmarks, API Token Pricing, Context Window & Speed Comparison

GetInfoUs リサーチチーム監修最終確認日: October 2026編集方針
共有
Related topics (12)
AI CompareAI BenchmarkToken PricingModel CostModel SpecsSWE-bench CodingModel VersusWhich AI ModelLLM Speed & LatencyReasoning ModelsExtended ThinkingPrompt Caching ROI
o3-pro vs Grok 4.20 (Reasoning): Benchmarks, Pricing & Speed Comparison

OpenAIのo3-proとxAIのGrok 4.20 (Reasoning)は、注目度の高い主要AIモデルです。o3-proは200K トークンのコンテキストウィンドウを備え、API料金は100万トークンあたり入力$20.00/出力$80.00、一方のGrok 4.20 (Reasoning)は1M トークンのコンテキストで入力$3.00/出力$15.00です。以下でベンチマーク、速度、コストを詳しく比較します。

徹底比較 (VS)

任意のAIモデルを切り替えて比較

Select any AI models from our verified benchmark database to generate live side-by-side matrices.

Profile
Profile
Multi-Model Arena Stack:
5-Model Matrix Workbench
Popular Matchups:
OpenAI

o3-pro

ディープ推論・論理エンジン

OpenAI の o3-pro は、高度な数学的推論、科学技術計算、多段階の思考連鎖(Chain-of-Thought)向けに設計されたAIモデルです。200K のコンテキストウィンドウ、毎秒 30 トークンの生成速度、知能指数 58/100(1Mトークンあたり入力$20・出力$80)を実現しています。

Intelligence Index58 / 100
Input Token:

$20.00 / 1M

Output Token:

$80.00 / 1M

Context Window:

200K tokens

SWE-bench Verified:

71.5%

xAI

Grok 4.20 (Reasoning)

ディープ推論・論理エンジン

xAI の Grok 4.20 (Reasoning) は、高度な数学的推論、科学技術計算、多段階の思考連鎖(Chain-of-Thought)向けに設計されたAIモデルです。1M のコンテキストウィンドウ、毎秒 95 トークンの生成速度、知能指数 68/100(1Mトークンあたり入力$3・出力$15)を実現しています。

Intelligence Index68 / 100
Input Token:

$3.00 / 1M

Output Token:

$15.00 / 1M

Context Window:

1M tokens

SWE-bench Verified:

68.2%

ひと目でわかる主な違い

  • Grok 4.20 (Reasoning) is 5.7x cheaper for API usage (input + output tokens combined).
  • Grok 4.20 (Reasoning) has a larger context window (1M vs 200K tokens).
  • Grok 4.20 (Reasoning) is faster at 95 tok/s vs 30 tok/s.
  • o3-pro leads on SWE-bench coding (71.5% vs 68.2%).
Need definitions for token pricing, context, or benchmarks?Explore AI Glossary →
Featureo3-proGrok 4.20 (Reasoning)
Intelligence Index
Composite reasoning & knowledge score (0-100)
5868
Provider
OpenAIxAI
Input Price
Cost per million input tokens
$20.00 / 1M$3.00 / 1M
Output Price
Cost per million output tokens
$80.00 / 1M$15.00 / 1M
Blended Price
Weighted 7:2:1 cache:input:output per 1M
$15.50 / 1M$2.63 / 1M
Context Window
Maximum input + output tokens
200K tokens~300 A4 pages of text1M tokens~1,500 A4 pages of text
Max Output Tokens
Per single request
100K66K
Throughput Speed
Tokens generated per second
30 tok/s95 tok/s
SWE-bench Verified
Real-world software engineering
71.5%68.2%
GPQA Diamond
Graduate-level reasoning
79.5%72.8%
Cached Input Price
Prompt caching discount per 1M tokens
$5.00 / 1M$0.75 / 1M

分野別勝者スコアカード

At-a-glance decision framework
Coding
o3-pro
+3.3% SWE-bench lead
Cost
Grok 4.20 (Reasoning)
5.7x cheaper monthly runtime
Speed
Grok 4.20 (Reasoning)
+217% faster generation
Context
Grok 4.20 (Reasoning)
1M tokens window

検証済みベンチマークスコア比較

Official evaluation metrics verified by independent third-party research labs.

o3-proGrok 4.20 (Reasoning)
SWE-bench Verified (Autonomous Coding)

Industry benchmark evaluating real-world GitHub issue resolution and multi-file debugging.

71.5%vs68.2%
GPQA Diamond (Doctorate-Level Science & Math)

Challenging questions created by domain experts to test complex PhD-level reasoning.

79.5%vs72.8%
MMLU-Pro (Multi-task Language Understanding)

Hardened reasoning and academic knowledge benchmark with reduced lucky-guess probability.

88.5%vs84.1%
LMSYS Chatbot Arena Elo

Crowdsourced human preference evaluation based on blind, head-to-head model battles.

1352ptsvs1395pts
Humanity's Last Exam (Frontier Expert Knowledge)

Extremely difficult, closed-ended questions spanning the frontier of human expert knowledge.

13.6%vs11.8%
Terminal-Bench (Agentic Coding & Terminal Use)

Autonomous multi-step tasks executed inside a real command-line terminal environment.

47.5%vs44.5%
SciCode (Scientific Computing)

Research-grade coding problems drawn from real scientific and numerical workloads.

45.5%vs41.2%
LiveCodeBench (Competitive Coding)

Contamination-free competitive programming problems collected continuously over time.

73%vs66.5%
AIME (Advanced Math Competition)

American Invitational Mathematics Examination — multi-step Olympiad-level reasoning.

93%vs86.4%
Long-Context Reasoning

Accuracy when reasoning over very large inputs that fill the model context window.

80.5%vs89.2%
Generation Speed (Throughput)

Tokens emitted per second during active generation streaming.

30 tok/s vs95 tok/s

レイテンシ&応答時間

Time to first token (TTFT) and estimated end-to-end response time for a typical 500-token response.

Time to First Token (TTFT)Lower is better
o3-pro5.20s
Grok 4.20 (Reasoning)0.98s
Est. End-to-End Response (500 tokens)TTFT + generation time
o3-pro21.87s
Grok 4.20 (Reasoning)6.24s

リアルタイムAPIトークン料金シミュレーター

Adjust sliders to calculate projected monthly cloud API spending with prompt caching discounts.

100K / day
10K500K1M
30K / day
5K150K300K
50% cached
0% (Cold)50%90% (Warm)
o3-pro Monthly API Bill
$109.50 / month
$20/1M in · $80/1M out
Grok 4.20 (Reasoning) Monthly API Bill
$19.13 / month
$3/1M in · $15/1M out
Grok 4.20 (Reasoning) saves approximately $90.38 / month (83%) under this workload.5.7x Savings

o3-pro · Strengths & Key Advantages

  • 200K のコンテキストウィンドウと最大 100K トークンの出力容量(SWE-bench Verified 71.5% · GPQA Diamond 79.5%)
  • 毎秒 30 トークンの高速スループットと、初回トークン到達時間(TTFT)わずか 5200ms の低遅延
  • 優れたAPI経済性(1Mトークンあたり入力$20・出力$80)に加え、プロンプトキャッシュや構造化JSON出力・関数呼び出しに完全対応
Considerations & Trade-offs
  • クラウド専用のプロプライエタリモデルのため、モデル重みをダウンロードしてオフライン実行することはできません
  • 大量のトークンを処理する本番環境では、プロンプトキャッシュや Batch API の併用によるコスト最適化が推奨されます

Grok 4.20 (Reasoning) · Strengths & Key Advantages

  • 1M のコンテキストウィンドウと最大 66K トークンの出力容量(SWE-bench Verified 68.2% · GPQA Diamond 72.8%)
  • 毎秒 95 トークンの高速スループットと、初回トークン到達時間(TTFT)わずか 980ms の低遅延
  • 優れたAPI経済性(1Mトークンあたり入力$3・出力$15)に加え、プロンプトキャッシュや構造化JSON出力・関数呼び出しに完全対応
Considerations & Trade-offs
  • クラウド専用のプロプライエタリモデルのため、モデル重みをダウンロードしてオフライン実行することはできません
  • 大量のトークンを処理する本番環境では、プロンプトキャッシュや Batch API の併用によるコスト最適化が推奨されます

Token Use & Task Economics

Estimated cost and token consumption to complete one representative agentic task.

Metrico3-proGrok 4.20 (Reasoning)
Cost per Task
Estimated USD to finish one task
$11.68$1.45
Output Tokens / Task
Tokens generated per task
58K45K
Reasoning Tokens / Task
Thinking tokens burned per task
38K28K

技術仕様・スペック

Architecture, release timeline, capabilities, and modalities.

Featureo3-proGrok 4.20 (Reasoning)
Official API Model ID (SDK)o3-progrok-4-20-reasoning-latest
API ProtocolOpenAI Responses API & Chat Completions v1xAI REST API (OpenAI-Compatible)
Release Date2025-062026-03
Knowledge CutoffJune 2024November 2025
ArchitectureHigh-effort reasoning transformerColossus-Scale Reasoning Sparse MoE
ParametersConfidentialConfidential
Enterprise Rate Limits (RPM / TPM)10,000 – 30,000 RPM (Tier 5 Enterprise) · 800,000 – 2,000,000 TPM5,000 – 15,000 RPM (Production Tier) · 4,000,000 – 10,000,000 TPM
Long-Context Tier (>128K/200K)Flat rate ($20/1M in) across full 200K windowFlat rate ($3/1M in) across full 1000K window
Prompt Cache Policy & TTLAutomatic prefix caching at $5/1M (no extra cache-write fee)Cached input at $0.75/1M tokens
Computer Use / GUI AgentSupported (Screen coordinate grounding, browser & desktop GUI action loops)API / CLI Tool-Use & DOM Agent ready (no raw pixel desktop click loop)
MCP & Parallel Tool CallingNative MCP Client/Server ready · Parallel function calling · 100% Strict JSON SchemaNative MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema
Web Search Grounding & SandboxNative Web Search tool + Hosted Code Interpreter & File Search RAGReal-time Web & X (Twitter) Search Grounding + Code Execution
Official Fine-Tuning SupportSupervised Fine-Tuning (SFT), Direct Preference (DPO) & Reinforcement Fine-Tuning (RFT)API Prompt Engineering & RAG Distillation
Multimodal Token BillingText BPE (~4 chars/token) · Vision (~258–765 tokens per image tile)Text BPE (~4 chars/token) · Vision (~258–765 tokens per image tile)
Quantization & Min GPU VRAMCloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster) · Zero Local VRAM Required (100% Serverless Cloud API)Cloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster) · Zero Local VRAM Required (100% Serverless Cloud API)
Safety & Frontier ClassificationOpenAI Preparedness Framework Audited & System Card PublishedxAI Production Safety & Alignment Verified
Enterprise Compliance (ZDR/HIPAA/SOC2)SOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise TierSOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise Tier
Input Modalitiestext, visiontext, vision
Output Modalitiestexttext

o3-pro vs Grok 4.20 (Reasoning): よくある質問 (FAQ)

Which is more intelligent, o3-pro or Grok 4.20 (Reasoning)?

Grok 4.20 (Reasoning) is more intelligent. It scores 68 compared with 58 on the composite Intelligence Index.

Which model is faster?

Grok 4.20 (Reasoning) is faster, generating 95 tokens per second compared with 30 tokens per second.

Which model is cheaper to run?

Grok 4.20 (Reasoning) is cheaper at $2.63 per 1M tokens blended, compared with $15.50 (7:2:1 cache:input:output ratio).

Which model has lower latency?

Grok 4.20 (Reasoning) has lower latency, with a time to first token of 0.98s compared with 5.20s.

Which model has a larger context window?

Grok 4.20 (Reasoning) has a larger context window, supporting 1M tokens compared with 200K tokens.

総合評価

o3-pro(高度な数学的推論、科学技術計算、多段階の思考連鎖(Chain-of-Thought)、エンタープライズRAG基盤、スケーラブルな本番API統合に最適。)とGrok 4.20 (Reasoning)(高度な数学的推論、科学技術計算、多段階の思考連鎖(Chain-of-Thought)、エンタープライズRAG基盤、スケーラブルな本番API統合に最適。)はいずれも優れた選択肢です。高度な推論・コーディング精度ではGrok 4.20 (Reasoning)がリードし、応答速度とスループットではGrok 4.20 (Reasoning)が優れ、APIコスト効率ではGrok 4.20 (Reasoning)が有利です。

よくある質問 (FAQ)

コーディングや複雑な推論には o3-pro と Grok 4.20 (Reasoning) のどちらが適していますか?+

総合知能指数およびコーディング評価では Grok 4.20 (Reasoning) が優位です。上部の SWE-bench や GPQA スコアもあわせてご確認ください。

o3-pro と Grok 4.20 (Reasoning) ではどちらのAPI料金が安いですか?+

o3-pro は100万トークンあたり入力$20.00 / 出力$80.00、Grok 4.20 (Reasoning) は入力$3.00 / 出力$15.00です。総合的なコスト効率では Grok 4.20 (Reasoning) がより経済的です。

コンテキスト長と生成速度はどちらが優れていますか?+

コンテキストウィンドウは o3-pro が 200K トークン、Grok 4.20 (Reasoning) が 1M トークン です。出力スピード(トークン/秒)では Grok 4.20 (Reasoning) がリードしています。

AI Terminology & Guide
Explore Glossary →

Understand key metrics like context window, token pricing, reasoning mode, and SWE-bench scores in our comprehensive AI glossary.

Benchmark scores, token prices, and rate limits evolve rapidly as AI labs release model updates. Always verify current specifications and pricing on the official provider documentation.

公的ソース: OpenAIおよびxAI公式APIドキュメント、システムカード、独立ベンチマーク評価 (2026)。