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Claude Mythos Preview vs Gemini 3.8 Flash

Claude Mythos Preview and Gemini 3.8 Flash are closely matched at 55.1 and 51.0 on the LLM Stats Score. Gemini 3.8 Flash is 33.3x cheaper per token.

Anthropic · Google · Updated for 2026

Which is better?

Claude Mythos Preview and Gemini 3.8 Flash are closely matched on the overall LLM Stats Score at 55.1 and 51.0.

In the 1 individual benchmarks reported for both models, Claude Mythos Preview wins 1; this is a narrower head-to-head signal than the composite indexes.

On price, Gemini 3.8 Flash is roughly 33.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Mythos Preview

  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results

Choose Gemini 3.8 Flash

  • cost matters — it's about 33.3x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Gemini 3.8 Flash
Google
Core performance indexes
LLM Stats Score
55.1
#6
51.0
#15
Reasoning
55.9
#2
46.9
#24
Coding
44.9
#4
39.3
#14
Agents
36.2
#15
35.8
#16
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$25.00 / M
$0.75 / M
Output price
$125.00 / M
$3.75 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Mythos Preview
Gemini 3.8 Flash
Vision
39.1#3
33.8#15
Multimodal
36.9#5
34.8#12
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Claude Mythos Preview · 13 for Gemini 3.8 Flash

1 shared

Claude Mythos Preview outperforms in 1 benchmarks (CharXiv-R), while Gemini 3.8 Flash is better at 0 benchmarks.

Claude Mythos Preview significantly outperforms across most benchmarks.

Fri Sep 04 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 3.8 Flash costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 33.3x more expensive than Gemini 3.8 Flash ($0.75/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 33.3x more expensive than Gemini 3.8 Flash ($3.75/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Gemini 3.8 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Sep 04 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
Google
Gemini 3.8 Flash
Input tokens$0.75
Output tokens$3.75
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Only Gemini 3.8 Flash specifies input context (1,048,576 tokens). Only Gemini 3.8 Flash specifies output context (65,536 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Google
Gemini 3.8 Flash
Input1,048,576 tokens
Output65,536 tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos Preview and Gemini 3.8 Flash support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Mythos Preview

Text
Images
Audio
Video

Gemini 3.8 Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Mythos Preview

Proprietary

Closed source

Gemini 3.8 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3.8 Flash was released on 2026-09-02, while Claude Mythos Preview's release date is not specified.

We can confirm Gemini 3.8 Flash's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Gemini 3.8 Flash

Sep 2, 2026

1 days ago

Knowledge Cutoff

When training data ends

Gemini 3.8 Flash has a documented knowledge cutoff of 2026-03-31, while Claude Mythos Preview's cutoff date is not specified.

We can confirm Gemini 3.8 Flash's training data extends to 2026-03-31, but cannot make a direct comparison without Claude Mythos Preview's cutoff date.

Claude Mythos Preview

—

Gemini 3.8 Flash

Mar 2026

Provider Availability

Claude Mythos Preview is available from Anthropic. Gemini 3.8 Flash is available from Google.

Claude Mythos Preview

anthropic logo
Anthropic
Input Price:Input: $25.00/1MOutput Price:Output: $125.00/1M

Gemini 3.8 Flash

google logo
Google
Input Price:Input: $0.75/1MOutput Price:Output: $3.75/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Mythos Preview and Gemini 3.8 Flash side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Gemini 3.8 Flash
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Gemini 3.8 Flash.

Which is better, Claude Mythos Preview or Gemini 3.8 Flash?

Claude Mythos Preview and Gemini 3.8 Flash are closely matched on the LLM Stats Score at 55.1 and 51.0. Claude Mythos Preview is made by Anthropic and Gemini 3.8 Flash is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Mythos Preview compare to Gemini 3.8 Flash in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. Gemini 3.8 Flash scores Terminal-Bench 2.1: 89.4%, LVBench: 87.1%, CharXiv-R: 86.2%, LABBench2: 86.2%, DeepSWE 1.1: 73.7%.

Is Claude Mythos Preview cheaper than Gemini 3.8 Flash?

Gemini 3.8 Flash is 33.3x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. Gemini 3.8 Flash costs $0.75/M input and $3.75/M output via google.

What are the context window sizes for Claude Mythos Preview and Gemini 3.8 Flash?

Claude Mythos Preview supports an unknown number of tokens and Gemini 3.8 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Mythos Preview and Gemini 3.8 Flash?

Key differences include LLM Stats Score (55.1 vs 51.0), input pricing ($25.00 vs $0.75/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Gemini 3.8 Flash?

Claude Mythos Preview is developed by Anthropic and Gemini 3.8 Flash is developed by Google.

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