Phaseo

Claude Fable 5.2 vs GPT-6 Astra

Pick a route and service tier under each model. Prices, the calculator and the verdicts follow your choice.

Try Claude Fable 5.2 in Chat
Claude Fable 5.2
GPT-6 Astra

At a glance

Generated from the rows below

Choose Claude Fable 5.2 for

  • The lowest cost per typical request ($0.0324)

Choose GPT-6 Astra for

  • The largest context window: 1,050,000 tokens

The models are statistically tied on the Epoch Capabilities Index: their 95% confidence intervals overlap.

Overview

Lab
Anthropic
OpenAI
Context window
1Mtokens
1.05Mtokens (best)
Max output
128Ktokens
128Ktokens
Takes
Text, Image
Text, Image
Returns
Text
Text
Routes on Phaseo
2 providers
2 providers
Released
9 Nov 2026
3 Sept 2026

Pricing

Prices on the route and tier chosen under each model

Anthropic · StandardOpenAI · Standard
Input
$7.20/ 1M tokensRegion: US$7.92
from $10.00/ 1M tokensInput ≤ 272K$10.00Input > 272K$20.00
Output
$36.00/ 1M tokensRegion: US$39.60
from $50.00/ 1M tokensInput ≤ 272K$50.00Input > 272K$75.00
Cache read
$0.18/ 1M tokensRegion: US$0.198
from $1.00/ 1M tokensInput ≤ 272K$1.00Input > 272K$2.00
Cache write, 5 minutes
$9.00/ 1M tokensRegion: US$9.90
No write fee listed
Cache write, 1 hour
$14.40/ 1M tokensRegion: US$15.84
No write fee listed
Cache write
No write fee listed
from $12.50/ 1M tokensInput ≤ 272K$12.50Input > 272K$25.00
Typical request2K tokens in, 500 out
$0.0324 (best)
$0.045

What will it cost?

Estimate a month of requests on the route and tier chosen for each model

ModelPer requestPer month
Claude Fable 5.2Anthropic · Standard$0.0324$972.00
GPT-6 AstraOpenAI · Standard$0.045$1,350

Uses the route and tier chosen under each model, over 30 days. Cached input is billed at the cache-read rate.

Performance

Live gateway traffic

Latency p50last 24 hours
3.01 s
No traffic in the last 5 days
Throughput p50last 24 hours
1.3 tps
No traffic in the last 5 days
Requests, last 24 hours
1
None in the last 24 hours

Activity

Tokens sent through Phaseo each day over the last 30 days

Tokens, last 30 days
22
406
Per day
22
12 Oct10 Nov
406
12 Oct10 Nov
Input
18
216
Output
4
190
Reasoning
0
0
Requests
1
20

Features

Features from the parameters Phaseo routes support

Tool calling
Yes
Yes
Structured outputs
Yes
Yes
Reasoning effort
Yes
Yes
Web search
Yes
Yes
Prompt cachingon the chosen route
Yes
Yes
Quantisationon the chosen route
Not stated
Not stated

Benchmarks

Only results that two or more of the selected models report get a row

Compare at effort

Epoch Capabilities Index Independent

Higher is better · dot is the estimate, band is the 95% confidence interval · Epoch AI, CC BY 4.0

Claude Fable 5.2174.2 95% CI 170.1–178.8
GPT-6 Astra169.2 95% CI 166.2–172.5

Every interval overlaps, so these models are statistically tied on this index.

Artificial Analysis Intelligence Index Independent

Higher is better · at Max effort · 2 of 2 models tested

Claude Fable 5.264.6
GPT-6 Astra56.9

Where they rank

The five leaders on each capability index, then the compared models. Each model at its best-scoring setting.

Artificial Analysis Intelligence Index58 models ranked

  1. #1Claude Fable 5.264.6
  2. #2Claude Opus 5.559.1
  3. #3GPT-6 Astra56.9
  4. #4GPT-6.1 Sol54.6
  5. #5Claude Sonnet 5.554.5

Artificial Analysis Coding Index171 models ranked

  1. #1Claude Fable 5.181.6
  2. #2GPT 5.6 Sol78.3
  3. #3Claude Opus 578.0
  4. #4GPT-6 Astra77.1
  5. #5Grok 4.676.8

Artificial Analysis Agentic Index112 models ranked

  1. #1Claude Fable 5.157.9
  2. #2Claude Opus 556.5
  3. #3Qwen 3.8 Max 090256.0
  4. #4Muse Spark 1.355.5
  5. #5Qwen 3.8 Flash Next53.6
  6. #8GPT-6 Astra51.0

Epoch Capabilities Index166 models ranked

  1. #1Claude Fable 5.2174.2
  2. #2GPT-6 Astra169.2
  3. #3GPT-6.1 Sol168.9
  4. #4Claude Opus 5.5168.7
  5. #5GPT-6.1 Terra168.1
Cost
Artificial Analysis Evaluation Cost (USD)matched by effort level · lower is better
$22,191
$5,661 (best)
General
Artificial Analysis Progress Index v1matched by effort level
358.0 (best)
349.6

Lab-reported results come from each lab’s own launch materials and may use different settings, so none is marked best. Independent results come from third-party evaluators.

Providers

Where each model runs on Phaseo, with standard-tier prices per 1M tokens. Providers that serve more of these models come first.

Anthropic
$7.20 in · $36.00 out$10.00 per 1K requests Native web search requests1M context · Standard, Batch, Priority
—
OpenAI
—
$10.00 in · $50.00 out$10.00 per 1K requests Native web search requests1.05M context · Standard, Batch, Flex, Priority, Ultrafast
Inference.net
—
$10.00 in · $50.00 out922K context
Venice
$8.00 in · $40.00 out$10.00 per 1K requests Web search1M context
—
Also listed, not routed
6 providers
4 providers

To price the whole page on one of these providers, pick it under the model’s name at the top.

Details

Knowledge cutoff
Not published
Apr 2026
Status
Available
Available
Licence
Proprietary
Proprietary
Subscription plans
None mapped
12 plansChatGPT Business, ChatGPT Business Codex, ChatGPT Business Premium…
API docs
Not published
Open docs

Claude Fable 5.2 vs GPT-6 Astra: side-by-side summary

Claude Fable 5.2 and GPT-6 Astra are both available through the Phaseo API, so switching between them is a change of model id rather than a new integration.

Claude Fable 5.2 is from Anthropic. It has a 1,000,000-token context window. On its cheapest route it costs $7.20 per 1M input tokens and $36.00 per 1M output tokens.

GPT-6 Astra is from OpenAI. It has a 1,050,000-token context window. On its cheapest route it costs $10.00 per 1M input tokens and $50.00 per 1M output tokens.

Claude Fable 5.2 model details, providers and pricingGPT-6 Astra model details, providers and pricing

Claude Fable 5.2 vs GPT-6 Astra at a glance

Claude Fable 5.2 and GPT-6 Astra compared on price, context window and benchmark score
AttributeClaude Fable 5.2GPT-6 Astra
LabAnthropicOpenAI
Input price per 1M tokens$7.20$10.00
Output price per 1M tokens$36.00$50.00
Context window1,000,000 tokens1,050,000 tokens
Max output128,000 tokens128,000 tokens
Artificial Analysis Intelligence Index64.6 (#1)56.9 (#3)

Prices are each model's cheapest standard route on Phaseo. Benchmark ranks use each model's best-scoring evaluated setting.

Frequently asked questions

Which is cheaper, Claude Fable 5.2 or GPT-6 Astra?

Claude Fable 5.2 is cheaper for both input and output tokens. Claude Fable 5.2 costs $7.20 per 1M input tokens and $36.00 per 1M output tokens; GPT-6 Astra costs $10.00 and $50.00, each on its cheapest standard route on Phaseo.

Which has the longer context window, Claude Fable 5.2 or GPT-6 Astra?

GPT-6 Astra has the longer context window at 1,050,000 tokens, compared with 1,000,000 tokens for Claude Fable 5.2.

Which scores higher on the Artificial Analysis Intelligence Index, Claude Fable 5.2 or GPT-6 Astra?

Claude Fable 5.2 scores higher on the Artificial Analysis Intelligence Index. Claude Fable 5.2 scores 64.6, ranked #1 of 58. GPT-6 Astra scores 56.9, ranked #3 of 58.

Can I use Claude Fable 5.2 and GPT-6 Astra through one API?

Yes. Both are served through the Phaseo API, so you can switch between them by changing the model id.

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