Compare · ModelsLive · 3 picked · head to head
Claude Mythos Preview vs GPT-5 Chat vs Gemini 3.1 Pro Preview
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
Claude Mythos Preview wins on 3/4 benchmarks
Claude Mythos Preview wins 3 of 4 shared benchmarks. Leads in knowledge · coding.
Category leads
arena·Gemini 3.1 Pro Previewknowledge·Claude Mythos Previewcoding·Claude Mythos Preview
Hype vs Reality
Attention vs performance
Claude Mythos Preview
#2 by perf·#2 by attention
GPT-5 Chat
#1 by perf·#1 by attention
Gemini 3.1 Pro Preview
#36 by perf·no signal
Best value
GPT-5 Chat
1.7x better value than Gemini 3.1 Pro Preview
Claude Mythos Preview
—
no price
GPT-5 Chat
14.6 pts/$
$5.63/M
Gemini 3.1 Pro Preview
8.7 pts/$
$7.00/M
Vendor risk
Who is behind the model
Anthropic
$380.0B·Tier 1
OpenAI
$840.0B·Tier 1
Google DeepMind
$4.00T·Tier 1
Head to head
4 benchmarks · 3 models
Claude Mythos PreviewGPT-5 ChatGemini 3.1 Pro Preview
Chatbot Arena Elo · Overall
Gemini 3.1 Pro Preview leads by +66.6
GPT-5 Chat
1426.0
Gemini 3.1 Pro Preview
1492.6
GPQA diamond
Claude Mythos Preview leads by +2.4
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
Claude Mythos Preview
94.5
Gemini 3.1 Pro Preview
92.1
SWE-Bench verified
Claude Mythos Preview leads by +18.3
Claude Mythos Preview
93.9
Gemini 3.1 Pro Preview
75.6
Terminal Bench
Claude Mythos Preview leads by +3.6
Terminal Bench · tests the ability to accomplish real-world tasks using terminal commands, evaluating shell scripting and CLI tool proficiency.
Claude Mythos Preview
82.0
Gemini 3.1 Pro Preview
78.4
Full benchmark table
| Benchmark | Claude Mythos Preview | GPT-5 Chat | Gemini 3.1 Pro Preview |
|---|---|---|---|
Chatbot Arena Elo · Overall | — | 1426.0 | 1492.6 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 94.5 | — | 92.1 |
SWE-Bench verified | 93.9 | — | 75.6 |
Terminal Bench Terminal Bench · tests the ability to accomplish real-world tasks using terminal commands, evaluating shell scripting and CLI tool proficiency. | 82.0 | — | 78.4 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| Claude Mythos Preview | — | — | 1.0M tokens (~500 books) | — |
| GPT-5 Chat | $1.25 | $10.00 | 128K tokens (~64 books) | $34.38 |
| Gemini 3.1 Pro Preview | $2.00 | $12.00 | 1.0M tokens (~524 books) | $45.00 |
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