Claude Mythos 5.2 vs GPT-6.1 Terra
Claude Mythos 5.2 leads the LLM Stats Score 59.6 to 47.0. GPT-6.1 Terra is 8.0x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Mythos 5.2 leads the overall LLM Stats Score 59.6 to 47.0, ranking #2 overall.
In the 2 individual benchmarks reported for both models, Claude Mythos 5.2 wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, GPT-6.1 Terra is roughly 8.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6.1 Terra also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Mythos 5.2
- overall performance matters — it scores 59.6 and ranks #2 on LLM Stats
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you want the most recent training data — it shipped Nov 2026
Choose GPT-6.1 Terra
- cost matters — it's about 8.0x cheaper per token
- you process long inputs — it offers a 1,050,000 token context window
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
9 reported for Claude Mythos 5.2 · 9 for GPT-6.1 Terra
Claude Mythos 5.2 outperforms in 2 benchmarks (Terminal-Bench 4.0, Terminal-Bench-Science 0.1), while GPT-6.1 Terra is better at 0 benchmarks.
Claude Mythos 5.2 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Mythos 5.2 ($8.00/1M tokens) is 8.0x more expensive than GPT-6.1 Terra ($1.00/1M tokens).
For output processing, Claude Mythos 5.2 ($40.00/1M tokens) is 8.0x more expensive than GPT-6.1 Terra ($5.00/1M tokens).
In conclusion, Claude Mythos 5.2 is more expensive than GPT-6.1 Terra.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6.1 Terra accepts 1,050,000 input tokens compared to Claude Mythos 5.2's 1,000,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Mythos 5.2 and GPT-6.1 Terra support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Mythos 5.2
GPT-6.1 Terra
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Mythos 5.2 was released on 2026-11-09, while GPT-6.1 Terra was released on 2026-10-26.
Claude Mythos 5.2 is 0 month newer than GPT-6.1 Terra.
Nov 9, 2026
3 days ago
2w newerOct 26, 2026
2 weeks ago
Knowledge Cutoff
When training data ends
Both models have the same knowledge cutoff date of 2026-06-01.
They should have similar awareness of historical events and information up to this date.
Jun 2026
Jun 2026
Provider Availability
Claude Mythos 5.2 is available from Anthropic. GPT-6.1 Terra is available from OpenAI.
Claude Mythos 5.2
GPT-6.1 Terra
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.2 and GPT-6.1 Terra side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.2 vs GPT-6.1 Terra.