text model comparison
Claude Mythos 5.2 vs GPT-6 Astra
Claude Mythos 5.2 and GPT-6 Astra are both current text models, from Anthropic and OpenAI. Claude Mythos 5.2 is 20% cheaper per 1M input tokens than GPT-6 Astra, $8 vs $10. In Anthropic's Claude Fable 5.2 launch table, Claude Mythos 5.2 scores 75.3% on Terminal-Bench-Science 0.1 and GPT-6 Astra 68.1%. GPT-6 Astra has the larger context window, 1,050,000 vs 1,000,000 tokens.
- Lower price per 1M input tokens
- Claude Mythos 5.2$8 against $10
- Longer context window
- GPT-6 Astra1.05M tokens against 1M tokens
- Newer release
- Claude Mythos 5.2Nov 2026 against Sep 2026
Data verified November 10, 2026 · Dataset 2026-11-10
Side by side
Claude Mythos 5.2 and GPT-6 Astra, line by line
Prices in effect today, compared at the same tier wherever both list one. The better value in each row is highlighted.
| Fact | Claude Mythos 5.2 | GPT-6 Astra |
|---|---|---|
| Price | ||
| Price per 1M input tokens | $8 (better) | $10 |
| Price per 1M output tokens | $40 (better) | $50 |
| Independent benchmarks | ||
| Arena Text | Not measured | 1474 Elo (#22 of 53) |
| Arena WebDev | Not measured | 1767 Elo (#4 of 48) |
| GPQA Diamond | Not measured | 95.8% (#2 of 43) |
| FrontierMath Tiers 1-3 (v2) | Not measured | 93.7% (#2 of 43) |
| SimpleQA Verified | Not measured | 75.6% (#3 of 40) |
| Specs | ||
| Provider | Anthropic | OpenAI |
| Release date | November 9, 2026 | September 3, 2026 |
| Access | limited access | API only |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Input | text, image | text, image |
| Output | text | text |
No independent benchmark has scored both models yet. Each rank counts the current models scored on that benchmark.
Provider results
What the labs report
Results tables a lab published with one of its models, where it lists both Claude Mythos 5.2 and GPT-6 Astra. These are the lab's own figures, not independent measurements, and each table is read on its own: labs run benchmarks with different harnesses and budgets.
Anthropic, Claude Fable 5.2 launch table, November 9, 2026Anthropic · 2026-11-10
| Benchmark | Claude Mythos 5.2 | GPT-6 Astra |
|---|---|---|
| Terminal-Bench-Science 0.1 | 75.3% (better) | 68.1% |
Anthropic's table from the Claude Fable 5.2 and Mythos 5.2 announcement, each model at its highest available effort, with Anthropic's safeguards on; competitor figures come from their developers' system cards or the benchmarks' leaderboards. On FrontierCode 2.0 Fable 5.2 and 5.1 ran at xhigh effort and Gemini 4 Carbon at medium. Anthropic gives a Mythos 5.2 score for Terminal-Bench-Science only. Left out here: Anthropic's own evaluations (CVE Rediscovery, de novo binder design, RoboDojo Sim), Irregular's CyScenarioBench, where each lab's score covers different tasks, and Artificial Analysis's AA-Briefcase.
Charts
Against every current text model
Where Claude Mythos 5.2 and GPT-6 Astra land among the current models of their task, on every independent benchmark, on price and on context.
Where each stands
Only GPT-6 Astra has a current Arena Text score: #22 of 53. Each bar is the share of current models it beats.
Independent benchmarks
Arena Text
Claude Mythos 5.2: Not scored
GPT-6 Astra:#22of 53
1,474 Elo · ahead of 58%
Arena WebDev
Claude Mythos 5.2: Not scored
GPT-6 Astra:#4of 48
1,767 Elo · ahead of 94%
GPQA Diamond
Claude Mythos 5.2: Not scored
GPT-6 Astra:#2of 43
95.8% · ahead of 98%
FrontierMath Tiers 1-3 (v2)
Claude Mythos 5.2: Not scored
GPT-6 Astra:#2of 43
93.7% · ahead of 95%
SimpleQA Verified
Claude Mythos 5.2: Not scored
GPT-6 Astra:#3of 40
75.6% · ahead of 95%
Price and context
Price per 1M input tokens
Claude Mythos 5.2:#53of 61
$8 · cheaper than 12%
GPT-6 Astra:#55of 61
$10 · cheaper than 5%
Price per 1M output tokens
Claude Mythos 5.2:#53of 61
$40 · cheaper than 12%
GPT-6 Astra:#55of 61
$50 · cheaper than 5%
Context window
Claude Mythos 5.2:#28of 70
1M tokens · longer than 23%
GPT-6 Astra:#1of 70
1.05M tokens · longer than 86%
Quality against price
GPT-6 Astra scores 1,474 at $20 (blended price per 1M tokens). The line joins the current models no other beats on both price and Arena Text score; hover any point to name it.
Quality against price: the data
| Model | Provider | Blended price per 1M tokens | Arena Text (Elo) |
|---|---|---|---|
| Gemini 4 Carbon | $4 | 1,526 | |
| Gemini 4 Argon | $4 | 1,522 | |
| Muse Wonder | Meta | $8 | 1,511 |
| Claude Opus 5.5 | Anthropic | $8 | 1,506 |
| Claude Fable 5 | Anthropic | $20 | 1,504 |
| Claude Fable 5.1 | Anthropic | $20 | 1,503 |
| Gemini 3.8 Flash | $1.50 | 1,497 | |
| Muse Spark 1.3 | Meta | $2 | 1,496 |
| Claude Opus 5 | Anthropic | $10 | 1,490 |
| Kimi K3 | Moonshot Kimi | $6 | 1,487 |
| GPT-5.6 Sol | OpenAI | $8 | 1,485 |
| Qwen3.8-Max | Alibaba Qwen | $3 | 1,484 |
| Gemini 3.6 Flash | $3 | 1,483 | |
| GLM-5.3 | Z.ai | $2.15 | 1,483 |
| Claude Opus 4.8 | Anthropic | $10 | 1,482 |
| GPT-6.1 Sol | OpenAI | $4 | 1,482 |
| GPT-5.5 | OpenAI | $11 | 1,481 |
| MiMo-V2.6-Pro | Xiaomi MiMo | $0.54 | 1,480 |
| GPT-5.4 | OpenAI | $5.63 | 1,475 |
| DeepSeek-V4.1-Flash | DeepSeek | $0.52 | 1,475 |
| GPT-6 Astra | OpenAI | $20 | 1,474 |
| GLM-5.3-Flash | Z.ai | $0.24 | 1,474 |
| Gemini 3 Flash Preview | $1.13 | 1,473 | |
| Grok 4.20 | xAI | $1.56 | 1,472 |
| Claude Sonnet 5.5 | Anthropic | $4 | 1,472 |
| GPT-5.6 Terra | OpenAI | $4.50 | 1,468 |
| Grok 4.5 | xAI | $3 | 1,466 |
| DeepSeek-V4-Pro | DeepSeek | $1.98 | 1,464 |
| Claude Sonnet 5 | Anthropic | $4 | 1,461 |
| GPT-6 Sol | OpenAI | $4 | 1,457 |
| Grok 4.6 | xAI | $3 | 1,456 |
| Gemini 3.5 Flash-Lite | $0.85 | 1,455 | |
| GPT-5.6 Luna | OpenAI | $0.45 | 1,453 |
| MiMo-V2.6-Flash | Xiaomi MiMo | $0.18 | 1,448 |
| Step 5 Preview | StepFun | $1.43 | 1,448 |
| Grok 4.3 | xAI | $1.56 | 1,442 |
| Grok 4.7 | xAI | $3 | 1,442 |
| GPT-6 Luna | OpenAI | $0.20 | 1,441 |
| Mistral Large 4 | Mistral AI | $1.05 | 1,423 |
| Claude Haiku 5.5 | Anthropic | $0.20 | 1,422 |
| GPT-4.1 | OpenAI | $3.50 | 1,415 |
| Inkling 2 Small | Thinking Machines Lab | $0.47 | 1,412 |
| Solar Pro 4 | Upstage | $0.52 | 1,387 |
| GPT-4.1 mini | OpenAI | $0.70 | 1,383 |
| GPT-4.1 nano | OpenAI | $0.18 | 1,322 |
Cost
What each costs
Example workloads at each provider's listed rates, then every other rate either one lists. The cheaper figure in each row is highlighted.
The same work, priced
For 10M input and 2M output tokens, GPT-6 Astra costs 1.3 times as much as Claude Mythos 5.2, at each provider's listed rates.
10M input and 2M output tokens
GPT-6 Astra costs 1.3× as much
- Claude Mythos 5.2
- $160
- GPT-6 Astra
- $200
The same, with 9M of the input tokens cached
GPT-6 Astra costs 1.3× as much
- Claude Mythos 5.2
- $89.80
- GPT-6 Astra
- $119
| Workload or rate | Claude Mythos 5.2 | GPT-6 Astra |
|---|---|---|
| Example workloads | ||
| 10M input and 2M output tokens | $160 (better) | $200 |
| The same, with 9M of the input tokens cached | $89.80 (better) | $119 |
| The same, through the batch API | $80 | Not listed |
| Other listed rates | ||
| 1M input tokens, cached | $0.20 (better) | $1 |
| 1M input tokens, 5-minute cache write | $10 | Not listed |
| 1M input tokens, 1-hour cache write | $16 | Not listed |
| 1M input tokens, batch | $4 | Not listed |
| 1M output tokens, batch | $20 | Not listed |
Your own bill will differ. These figures use list prices and example workloads. The AI Model Cost Audit reviews your real usage, shortlists models that score as well for each task for less, and estimates the savings.
Launch price $100, regular price $150
Verdict
When to choose each
Claude Mythos 5.2
Where it leads
- Lower input and output prices, $8 and $40 vs $10 and $50 per 1M tokens
- Cheaper cached input, $0.20 vs $1 per 1M tokens
- Batch pricing, $4 input and $20 output per 1M tokens
Best for
- Vetted security teams finding, reproducing and fixing vulnerabilities
- Dual-use research in security or biology that Claude Fable 5.2's safeguards block
Watch out for
- Limited access: only organisations verified through Anthropic's programs, such as the Cyber Verification Program, can call it
- No independent benchmark has scored it; every number for it comes from Anthropic
GPT-6 Astra
Where it leads
- Larger context window 1,050,000 vs 1,000,000 tokens
Best for
- Frontier reasoning and agentic evaluations where deep-context retrieval accuracy is the binding constraint
- Workloads that can be kept under the long-context threshold, where the effective rate stays at $10 / $50
Watch out for
- Long-context billing is a cliff, not a taper: a request over the long-context threshold is rebilled in full at $20 per million input and $75 per million output, so a prompt that crosses it costs roughly double
- GPT-6 Astra is the first publicly released model OpenAI classifies as crossing the Critical cybersecurity threshold under its own Preparedness Framework, which carries additional deployment safeguards
- Vendor-reported benchmark figures come from OpenAI’s own launch material and its own harness; they are not independently reproduced here
From benchmark to production
Building on Claude Mythos 5.2 or GPT-6 Astra?
Public scores rarely hold on your own data. We test both models on your real tasks, then build the agent or pipeline around the one that wins.
AI Model Cost AuditLaunch price $100, regular price $150What the audit includes
FAQ
Claude Mythos 5.2 vs GPT-6 Astra FAQ
Which is cheaper, Claude Mythos 5.2 or GPT-6 Astra?
Claude Mythos 5.2 is 20% cheaper per 1M input tokens than GPT-6 Astra, $8 vs $10. For 10M input and 2M output tokens, Claude Mythos 5.2 costs $160 and GPT-6 Astra $200 at standard rates.
Which is cheaper with prompt caching, Claude Mythos 5.2 or GPT-6 Astra?
Claude Mythos 5.2 charges $0.20 per 1M cached input tokens, 98% below its standard input rate, and GPT-6 Astra $1, 90% below. With 9M of 10M input tokens cached and 2M output tokens, Claude Mythos 5.2 costs $89.80 and GPT-6 Astra $119.
How do Claude Mythos 5.2 and GPT-6 Astra compare in Anthropic's own results?
In the Claude Fable 5.2 launch table (November 9, 2026), Claude Mythos 5.2 leads on Terminal-Bench-Science 0.1, 75.3% to 68.1%. These are Anthropic's figures, not independent measurements.
Which has the larger context window, Claude Mythos 5.2 or GPT-6 Astra?
GPT-6 Astra has the larger context window, 1,050,000 vs 1,000,000 tokens. Both return up to 128,000 tokens per response.
Further reading
More on Claude Mythos 5.2 and GPT-6 Astra
Articles on Claude Mythos 5.2 and GPT-6 Astra
- Claude Fable 5.2 vs Opus 5.5, GPT-6 Astra and Mythos 5.2November 10, 2026 · compares both
- GPT-Rosalind-6: OpenAI's Biology Model and Trusted AccessNovember 1, 2026
- OpenAI Models on Google Cloud: What Changes for AI TeamsOctober 22, 2026
- Gemini 4 Argon Benchmarks: What Independent Tests ShowOctober 1, 2026
- Gemini 4 Pro Leaks: What's Verified and What's HypeOctober 1, 2026
- GDPval-AA Chart Fact-Check: Opus 5.5 vs GPT-6 Astra on CostSeptember 24, 2026
Related comparisons
- Claude Fable 5.1 vs Claude Mythos 5.2
- Gemini 4 Argon vs GPT-6 Astra
- Claude Fable 5.2 vs Claude Mythos 5.2
- GPT-6.1 Sol vs GPT-6 Astra
- Claude Fable 5 vs Claude Mythos 5.2
- Claude Sonnet 5.5 vs GPT-6 Astra
- Claude Mythos 5.1 vs Claude Mythos 5.2
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Mythos 5.2 vs Claude Opus 5.5
- GPT-6 Astra vs GPT-6 Luna
- Claude Mythos 5.2 vs Gemini 4 Carbon
- GPT-6 Astra vs GPT-6 Sol
Production evaluation
Choosing between Claude Mythos 5.2 and GPT-6 Astra?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty